64612440 has 48 divisors (see below), whose sum is σ = 209991600. Its totient is φ = 17229888.

The previous prime is 64612439. The next prime is 64612453. The reversal of 64612440 is 4421646.

64612440 is a `hidden beast` number, since 6 + 4 + 612 + 4 + 40 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89380 + ... + 90099.

It is an arithmetic number, because the mean of its divisors is an integer number (4374825).

Almost surely, 2^64612440 is an apocalyptic number.

64612440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64612440 is an abundant number, since it is smaller than the sum of its proper divisors (145379160).

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

64612440 is a wasteful number, since it uses less digits than its factorization.

64612440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179496 (or 179489 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 64612440 is about 8038.1863626069. The cubic root of 64612440 is about 401.2718682582.

The spelling of 64612440 in words is "sixty-four million, six hundred twelve thousand, four hundred forty".