6385695978 has 32 divisors (see below), whose sum is σ = 13447180800. Its totient is φ = 2015994096.

The previous prime is 6385695973. The next prime is 6385695989. The reversal of 6385695978 is 8795965836.

6385695978 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×6385695978² = 81554226246890752968, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6385695971) 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, 768675 + ... + 776937.

It is an arithmetic number, because the mean of its divisors is an integer number (420224400).

Almost surely, 2^6385695978 is an apocalyptic number.

6385695978 is an abundant number, since it is smaller than the sum of its proper divisors (7061484822).

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

6385695978 is a wasteful number, since it uses less digits than its factorization.

6385695978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15066.

The product of its digits is 97977600, while the sum is 66.

The square root of 6385695978 is about 79910.5498541963. The cubic root of 6385695978 is about 1855.2513060816.

The spelling of 6385695978 in words is "six billion, three hundred eighty-five million, six hundred ninety-five thousand, nine hundred seventy-eight".