64407544 has 32 divisors (see below), whose sum is σ = 126720000. Its totient is φ = 30631392.

The previous prime is 64407517. The next prime is 64407547. The reversal of 64407544 is 44570446.

64407544 = 467² + 468² + ... + 665².

It is a super-2 number, since 2×64407544² = 8296663448223872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64407547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35737 + ... + 37495.

It is an arithmetic number, because the mean of its divisors is an integer number (3960000).

Almost surely, 2^64407544 is an apocalyptic number.

It is an amenable number.

64407544 is a deficient number, since it is larger than the sum of its proper divisors (62312456).

64407544 is a wasteful number, since it uses less digits than its factorization.

64407544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1987 (or 1983 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 34.

The square root of 64407544 is about 8025.4310787646. The cubic root of 64407544 is about 400.8472541340.

The spelling of 64407544 in words is "sixty-four million, four hundred seven thousand, five hundred forty-four".