516445640 has 32 divisors (see below), whose sum is σ = 1175067000. Its totient is φ = 204255744.

The previous prime is 516445619. The next prime is 516445651. The reversal of 516445640 is 46544615.

It can be written as a sum of positive squares in 4 ways, for example, as 348120964 + 168324676 = 18658^2 + 12974^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 516445640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68975 + ... + 76094.

Almost surely, 2^516445640 is an apocalyptic number.

It is an amenable number.

516445640 is an abundant number, since it is smaller than the sum of its proper divisors (658621360).

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

516445640 is a wasteful number, since it uses less digits than its factorization.

516445640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145169 (or 145165 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 516445640 is about 22725.4403697706. The cubic root of 516445640 is about 802.3087680777.

The spelling of 516445640 in words is "five hundred sixteen million, four hundred forty-five thousand, six hundred forty".