64312880 has 20 divisors (see below), whose sum is σ = 149527632. Its totient is φ = 25725120.

The previous prime is 64312877. The next prime is 64312901. The reversal of 64312880 is 8821346.

64312880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×64312880² = 8272293067788800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401876 + ... + 402035.

Almost surely, 2^64312880 is an apocalyptic number.

It is an amenable number.

64312880 is an abundant number, since it is smaller than the sum of its proper divisors (85214752).

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

64312880 is a wasteful number, since it uses less digits than its factorization.

64312880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803924 (or 803918 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 64312880 is about 8019.5311583658. The cubic root of 64312880 is about 400.6507739922.

The spelling of 64312880 in words is "sixty-four million, three hundred twelve thousand, eight hundred eighty".