6390644652 has 72 divisors (see below), whose sum is σ = 18737462016. Its totient is φ = 1798641504.

The previous prime is 6390644639. The next prime is 6390644669. The reversal of 6390644652 is 2564460936.

6390644652 is a `hidden beast` number, since 639 + 0 + 6 + 4 + 4 + 6 + 5 + 2 = 666.

It is a super-2 number, since 2×6390644652² = 81680678136272402208, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6390644598 and 6390644607.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 172368 + ... + 206135.

It is an arithmetic number, because the mean of its divisors is an integer number (260242528).

Almost surely, 2^6390644652 is an apocalyptic number.

It is an amenable number.

6390644652 is an abundant number, since it is smaller than the sum of its proper divisors (12346817364).

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

6390644652 is a wasteful number, since it uses less digits than its factorization.

6390644652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378587 (or 378582 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

The square root of 6390644652 is about 79941.5076915616. The cubic root of 6390644652 is about 1855.7304323090.

The spelling of 6390644652 in words is "six billion, three hundred ninety million, six hundred forty-four thousand, six hundred fifty-two".