64722587 has 16 divisors (see below), whose sum is σ = 70282080. Its totient is φ = 59377152.

The previous prime is 64722563. The next prime is 64722599. The reversal of 64722587 is 78522746.

It is a cyclic number.

It is not a de Polignac number, because 64722587 - 2¹⁸ = 64460443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64722527) 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 15 ways as a sum of consecutive naturals, for example, 173333 + ... + 173705.

It is an arithmetic number, because the mean of its divisors is an integer number (4392630).

Almost surely, 2^64722587 is an apocalyptic number.

64722587 is a deficient number, since it is larger than the sum of its proper divisors (5559493).

64722587 is a wasteful number, since it uses less digits than its factorization.

64722587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622.

The product of its digits is 188160, while the sum is 41.

The square root of 64722587 is about 8045.0349284512. The cubic root of 64722587 is about 401.4997593601.

The spelling of 64722587 in words is "sixty-four million, seven hundred twenty-two thousand, five hundred eighty-seven".