64399287 has 16 divisors (see below), whose sum is σ = 90316800. Its totient is φ = 40737312.

The previous prime is 64399273. The next prime is 64399319. The reversal of 64399287 is 78299346.

It is not a de Polignac number, because 64399287 - 2¹⁰ = 64398263 is a prime.

It is a super-3 number, since 3×64399287³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64399087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5089 + ... + 12437.

It is an arithmetic number, because the mean of its divisors is an integer number (5644800).

Almost surely, 2^64399287 is an apocalyptic number.

64399287 is a deficient number, since it is larger than the sum of its proper divisors (25917513).

64399287 is a wasteful number, since it uses less digits than its factorization.

64399287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7502.

The product of its digits is 653184, while the sum is 48.

The square root of 64399287 is about 8024.9166350810. The cubic root of 64399287 is about 400.8301239604.

The spelling of 64399287 in words is "sixty-four million, three hundred ninety-nine thousand, two hundred eighty-seven".