6438385156 has 24 divisors (see below), whose sum is σ = 12881232000. Its totient is φ = 2758351872.

The previous prime is 6438385111. The next prime is 6438385159. The reversal of 6438385156 is 6515838346.

It is a super-2 number, since 2×6438385156² = 82905606834002288672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6438385159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45636 + ... + 122308.

It is an arithmetic number, because the mean of its divisors is an integer number (536718000).

Almost surely, 2^6438385156 is an apocalyptic number.

It is an amenable number.

6438385156 is an abundant number, since it is smaller than the sum of its proper divisors (6442846844).

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

6438385156 is a wasteful number, since it uses less digits than its factorization.

6438385156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79683 (or 79681 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 49.

The square root of 6438385156 is about 80239.5485779924. The cubic root of 6438385156 is about 1860.3399729271.

The spelling of 6438385156 in words is "six billion, four hundred thirty-eight million, three hundred eighty-five thousand, one hundred fifty-six".