478708639 has 2 divisors, whose sum is σ = 478708640. Its totient is φ = 478708638.

The previous prime is 478708631. The next prime is 478708651. The reversal of 478708639 is 936807874.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 478708639 - 2³ = 478708631 is a prime.

It is a super-2 number, since 2×478708639² = 458323922106464642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478708631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239354319 + 239354320.

It is an arithmetic number, because the mean of its divisors is an integer number (239354320).

Almost surely, 2^478708639 is an apocalyptic number.

478708639 is a deficient number, since it is larger than the sum of its proper divisors (1).

478708639 is an equidigital number, since it uses as much as digits as its factorization.

478708639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The square root of 478708639 is about 21879.4113037805. The cubic root of 478708639 is about 782.2707438101.

The spelling of 478708639 in words is "four hundred seventy-eight million, seven hundred eight thousand, six hundred thirty-nine".