478807657 has 12 divisors (see below), whose sum is σ = 512284980. Its totient is φ = 447368832.

The previous prime is 478807643. The next prime is 478807673. The reversal of 478807657 is 756708874.

It can be written as a sum of positive squares in 2 ways, for example, as 162537001 + 316270656 = 12749^2 + 17784^2 .

It is not a de Polignac number, because 478807657 - 2¹¹ = 478805609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478807607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17269 + ... + 35437.

It is an arithmetic number, because the mean of its divisors is an integer number (42690415).

Almost surely, 2^478807657 is an apocalyptic number.

It is an amenable number.

478807657 is a deficient number, since it is larger than the sum of its proper divisors (33477323).

478807657 is a wasteful number, since it uses less digits than its factorization.

478807657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18280 (or 18261 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 52.

The square root of 478807657 is about 21881.6739990340. The cubic root of 478807657 is about 782.3246760897.

The spelling of 478807657 in words is "four hundred seventy-eight million, eight hundred seven thousand, six hundred fifty-seven".