64887731 has 8 divisors (see below), whose sum is σ = 66739200. Its totient is φ = 63051912.

The previous prime is 64887727. The next prime is 64887733. The reversal of 64887731 is 13778846.

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 64887731 - 2² = 64887727 is a prime.

It is a super-2 number, since 2×64887731² = 8420835268656722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64887733) 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, 4766 + ... + 12348.

It is an arithmetic number, because the mean of its divisors is an integer number (8342400).

Almost surely, 2^64887731 is an apocalyptic number.

64887731 is a deficient number, since it is larger than the sum of its proper divisors (1851469).

64887731 is a wasteful number, since it uses less digits than its factorization.

64887731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7825.

The product of its digits is 225792, while the sum is 44.

The square root of 64887731 is about 8055.2921114011. The cubic root of 64887731 is about 401.8409538077.

The spelling of 64887731 in words is "sixty-four million, eight hundred eighty-seven thousand, seven hundred thirty-one".