64521887 has 8 divisors (see below), whose sum is σ = 66272976. Its totient is φ = 62782272.

The previous prime is 64521857. The next prime is 64521893. The reversal of 64521887 is 78812546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64521887 - 2¹⁴ = 64505503 is a prime.

It is a super-3 number, since 3×64521887³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64521857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9203 + ... + 14619.

It is an arithmetic number, because the mean of its divisors is an integer number (8284122).

Almost surely, 2^64521887 is an apocalyptic number.

64521887 is a deficient number, since it is larger than the sum of its proper divisors (1751089).

64521887 is a wasteful number, since it uses less digits than its factorization.

64521887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5737.

The product of its digits is 107520, while the sum is 41.

The square root of 64521887 is about 8032.5517116294. The cubic root of 64521887 is about 401.0843225389.

The spelling of 64521887 in words is "sixty-four million, five hundred twenty-one thousand, eight hundred eighty-seven".