609878664 has 24 divisors (see below), whose sum is σ = 1651754910. Its totient is φ = 203292864.

The previous prime is 609878651. The next prime is 609878669. The reversal of 609878664 is 466878906.

It can be written as a sum of positive squares in only one way, i.e., 557432100 + 52446564 = 23610^2 + 7242^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 609878664.

It is not an unprimeable number, because it can be changed into a prime (609878669) 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, 4235197 + ... + 4235340.

Almost surely, 2^609878664 is an apocalyptic number.

It is an amenable number.

609878664 is an abundant number, since it is smaller than the sum of its proper divisors (1041876246).

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

609878664 is a wasteful number, since it uses less digits than its factorization.

609878664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8470549 (or 8470542 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The square root of 609878664 is about 24695.7215727745. The cubic root of 609878664 is about 848.0363733360.

The spelling of 609878664 in words is "six hundred nine million, eight hundred seventy-eight thousand, six hundred sixty-four".