64722440 has 32 divisors (see below), whose sum is σ = 146076480. Its totient is φ = 25808832.

The previous prime is 64722433. The next prime is 64722443. The reversal of 64722440 is 4422746.

64722440 = T₄₂₉ + T₄₃₀ + ... + T₇₇₅.

64722440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (64722443) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11549 + ... + 16211.

It is an arithmetic number, because the mean of its divisors is an integer number (4564890).

Almost surely, 2^64722440 is an apocalyptic number.

It is an amenable number.

64722440 is an abundant number, since it is smaller than the sum of its proper divisors (81354040).

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

64722440 is a wasteful number, since it uses less digits than its factorization.

64722440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5021 (or 5017 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 29.

The square root of 64722440 is about 8045.0257923763. The cubic root of 64722440 is about 401.4994553935.

The spelling of 64722440 in words is "sixty-four million, seven hundred twenty-two thousand, four hundred forty".