1018985680 has 40 divisors (see below), whose sum is σ = 2371122792. Its totient is φ = 407253504.

The previous prime is 1018985677. The next prime is 1018985683. The reversal of 1018985680 is 865898101.

It is an interprime number because it is at equal distance from previous prime (1018985677) and next prime (1018985683).

It can be written as a sum of positive squares in 4 ways, for example, as 558282384 + 460703296 = 23628^2 + 21464^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1018985680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1018985683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105202 + ... + 114478.

Almost surely, 2^1018985680 is an apocalyptic number.

1018985680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1018985680 is an abundant number, since it is smaller than the sum of its proper divisors (1352137112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1018985680 is a wasteful number, since it uses less digits than its factorization.

1018985680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10663 (or 10657 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 46.

The square root of 1018985680 is about 31921.5550999634. Note that the first 3 decimals coincide. The cubic root of 1018985680 is about 1006.2889264933.

The spelling of 1018985680 in words is "one billion, eighteen million, nine hundred eighty-five thousand, six hundred eighty".