64490204872 has 32 divisors (see below), whose sum is σ = 126802337400. Its totient is φ = 30706712064.

The previous prime is 64490204869. The next prime is 64490204887. The reversal of 64490204872 is 27840209446.

It can be written as a sum of positive squares in 4 ways, for example, as 63299540836 + 1190664036 = 251594^2 + 34506^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1887003 + ... + 1920874.

Almost surely, 2^64490204872 is an apocalyptic number.

It is an amenable number.

64490204872 is a deficient number, since it is larger than the sum of its proper divisors (62312132528).

64490204872 is a wasteful number, since it uses less digits than its factorization.

64490204872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3807985 (or 3807981 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 46.

The spelling of 64490204872 in words is "sixty-four billion, four hundred ninety million, two hundred four thousand, eight hundred seventy-two".