478665657 has 6 divisors (see below), whose sum is σ = 691405962. Its totient is φ = 319110432.

The previous prime is 478665653. The next prime is 478665659. The reversal of 478665657 is 756566874.

478665657 is a `hidden beast` number, since 4 + 78 + 6 + 6 + 565 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 326488761 + 152176896 = 18069^2 + 12336^2 .

It is not a de Polignac number, because 478665657 - 2² = 478665653 is a prime.

It is a super-2 number, since 2×478665657² = 458241622382483298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (478665653) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26592528 + ... + 26592545.

It is an arithmetic number, because the mean of its divisors is an integer number (115234327).

Almost surely, 2^478665657 is an apocalyptic number.

It is an amenable number.

478665657 is a deficient number, since it is larger than the sum of its proper divisors (212740305).

478665657 is a wasteful number, since it uses less digits than its factorization.

478665657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53185079 (or 53185076 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 54.

The square root of 478665657 is about 21878.4290340966. The cubic root of 478665657 is about 782.2473304261.

The spelling of 478665657 in words is "four hundred seventy-eight million, six hundred sixty-five thousand, six hundred fifty-seven".