1639494680 has 32 divisors (see below), whose sum is σ = 3713634000. Its totient is φ = 651394176.

The previous prime is 1639494673. The next prime is 1639494683. The reversal of 1639494680 is 864949361.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1639494683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131582 + ... + 143501.

Almost surely, 2^1639494680 is an apocalyptic number.

1639494680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1639494680 is an abundant number, since it is smaller than the sum of its proper divisors (2074139320).

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

1639494680 is a wasteful number, since it uses less digits than its factorization.

1639494680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275243 (or 275239 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 50.

The square root of 1639494680 is about 40490.6739879691. The cubic root of 1639494680 is about 1179.1525755134.

The spelling of 1639494680 in words is "one billion, six hundred thirty-nine million, four hundred ninety-four thousand, six hundred eighty".