64408940 has 12 divisors (see below), whose sum is σ = 135258816. Its totient is φ = 25763568.

The previous prime is 64408931. The next prime is 64408973. The reversal of 64408940 is 4980446.

It is a self number, because there is not a number n which added to its sum of digits gives 64408940.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1610204 + ... + 1610243.

It is an arithmetic number, because the mean of its divisors is an integer number (11271568).

Almost surely, 2^64408940 is an apocalyptic number.

It is an amenable number.

64408940 is an abundant number, since it is smaller than the sum of its proper divisors (70849876).

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

64408940 is a wasteful number, since it uses less digits than its factorization.

64408940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220456 (or 3220454 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 64408940 is about 8025.5180518145. The cubic root of 64408940 is about 400.8501501650.

The spelling of 64408940 in words is "sixty-four million, four hundred eight thousand, nine hundred forty".