1061409780 has 72 divisors (see below), whose sum is σ = 3263754312. Its totient is φ = 279161856.

The previous prime is 1061409737. The next prime is 1061409781. The reversal of 1061409780 is 879041601.

It can be written as a sum of positive squares in 4 ways, for example, as 450627984 + 610781796 = 21228^2 + 24714^2 .

It is a super-2 number, since 2×1061409780² = 2253181442159296800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1061409781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27249 + ... + 53528.

It is an arithmetic number, because the mean of its divisors is an integer number (45329921).

Almost surely, 2^1061409780 is an apocalyptic number.

1061409780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1061409780 is an abundant number, since it is smaller than the sum of its proper divisors (2202344532).

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

1061409780 is a wasteful number, since it uses less digits than its factorization.

1061409780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80865 (or 80860 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1061409780 is about 32579.2845225306. The cubic root of 1061409780 is about 1020.0646441152.

The spelling of 1061409780 in words is "one billion, sixty-one million, four hundred nine thousand, seven hundred eighty".