64986987 has 16 divisors (see below), whose sum is σ = 93459968. Its totient is φ = 39929760.

The previous prime is 64986979. The next prime is 64986991. The reversal of 64986987 is 78968946.

It is not a de Polignac number, because 64986987 - 2³ = 64986979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64986917) 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, 44958 + ... + 46380.

It is an arithmetic number, because the mean of its divisors is an integer number (5841248).

Almost surely, 2^64986987 is an apocalyptic number.

64986987 is a deficient number, since it is larger than the sum of its proper divisors (28472981).

64986987 is a wasteful number, since it uses less digits than its factorization.

64986987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610.

The product of its digits is 5225472, while the sum is 57.

The square root of 64986987 is about 8061.4506759019. The cubic root of 64986987 is about 402.0457424249.

The spelling of 64986987 in words is "sixty-four million, nine hundred eighty-six thousand, nine hundred eighty-seven".