2639647902 has 32 divisors (see below), whose sum is σ = 5592398112. Its totient is φ = 827746304.

The previous prime is 2639647897. The next prime is 2639647909. The reversal of 2639647902 is 2097469362.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639647909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291028 + ... + 299960.

It is an arithmetic number, because the mean of its divisors is an integer number (174762441).

Almost surely, 2^2639647902 is an apocalyptic number.

2639647902 is an abundant number, since it is smaller than the sum of its proper divisors (2952750210).

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

2639647902 is a wasteful number, since it uses less digits than its factorization.

2639647902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11852.

The product of its (nonzero) digits is 979776, while the sum is 48.

The square root of 2639647902 is about 51377.5038513939. The cubic root of 2639647902 is about 1382.0232001847.

The spelling of 2639647902 in words is "two billion, six hundred thirty-nine million, six hundred forty-seven thousand, nine hundred two".