6389449920 has 168 divisors, whose sum is σ = 25116702624. Its totient is φ = 1460441088.

The previous prime is 6389449919. The next prime is 6389449931. The reversal of 6389449920 is 299449836.

6389449920 is a `hidden beast` number, since 63 + 8 + 94 + 499 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

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, 138309 + ... + 178628.

Almost surely, 2^6389449920 is an apocalyptic number.

6389449920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6389449920 is an abundant number, since it is smaller than the sum of its proper divisors (18727252704).

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

6389449920 is a wasteful number, since it uses less digits than its factorization.

6389449920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316967 (or 316954 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The square root of 6389449920 is about 79934.0348037055. The cubic root of 6389449920 is about 1855.6147820719.

The spelling of 6389449920 in words is "six billion, three hundred eighty-nine million, four hundred forty-nine thousand, nine hundred twenty".