64842987 has 16 divisors (see below), whose sum is σ = 94493952. Its totient is φ = 39225120.

The previous prime is 64842961. The next prime is 64842989. The reversal of 64842987 is 78924846.

It is not a de Polignac number, because 64842987 - 2⁷ = 64842859 is a prime.

It is a super-2 number, since 2×64842987² = 8409225926164338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64842989) 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, 19833 + ... + 22869.

It is an arithmetic number, because the mean of its divisors is an integer number (5905872).

Almost surely, 2^64842987 is an apocalyptic number.

64842987 is a deficient number, since it is larger than the sum of its proper divisors (29650965).

64842987 is a wasteful number, since it uses less digits than its factorization.

64842987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3698.

The product of its digits is 774144, while the sum is 48.

The square root of 64842987 is about 8052.5143278357. The cubic root of 64842987 is about 401.7485680531.

It can be divided in two parts, 64 and 842987, that added together give a triangular number (843051 = T₁₂₉₈).

The spelling of 64842987 in words is "sixty-four million, eight hundred forty-two thousand, nine hundred eighty-seven".