509479988 has 6 divisors (see below), whose sum is σ = 891589986. Its totient is φ = 254739992.

The previous prime is 509479963. The next prime is 509480011. The reversal of 509479988 is 889974905.

It can be written as a sum of positive squares in only one way, i.e., 506340004 + 3139984 = 22502^2 + 1772^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63684995 + ... + 63685002.

It is an arithmetic number, because the mean of its divisors is an integer number (148598331).

Almost surely, 2^509479988 is an apocalyptic number.

It is an amenable number.

509479988 is a deficient number, since it is larger than the sum of its proper divisors (382109998).

509479988 is a wasteful number, since it uses less digits than its factorization.

509479988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127370001 (or 127369999 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 59.

The square root of 509479988 is about 22571.6633857587. The cubic root of 509479988 is about 798.6853345017.

The spelling of 509479988 in words is "five hundred nine million, four hundred seventy-nine thousand, nine hundred eighty-eight".