2691639520 has 48 divisors (see below), whose sum is σ = 6362284320. Its totient is φ = 1076099584.

The previous prime is 2691639499. The next prime is 2691639521. The reversal of 2691639520 is 259361962.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2691639521) 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, 462549 + ... + 468331.

It is an arithmetic number, because the mean of its divisors is an integer number (132547590).

Almost surely, 2^2691639520 is an apocalyptic number.

2691639520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2691639520 is an abundant number, since it is smaller than the sum of its proper divisors (3670644800).

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

2691639520 is a wasteful number, since it uses less digits than its factorization.

2691639520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8707 (or 8699 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 2691639520 is about 51881.0130972787. The cubic root of 2691639520 is about 1391.0379081027.

The spelling of 2691639520 in words is "two billion, six hundred ninety-one million, six hundred thirty-nine thousand, five hundred twenty".