64987974 has 32 divisors (see below), whose sum is σ = 152915040. Its totient is φ = 20388096.

The previous prime is 64987931. The next prime is 64987987. The reversal of 64987974 is 47978946.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 64987974.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34479 + ... + 36314.

It is an arithmetic number, because the mean of its divisors is an integer number (4778595).

Almost surely, 2^64987974 is an apocalyptic number.

64987974 is an abundant number, since it is smaller than the sum of its proper divisors (87927066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64987974 is a wasteful number, since it uses less digits than its factorization.

64987974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70821 (or 70815 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 64987974 is about 8061.5118929392. The cubic root of 64987974 is about 402.0477777921.

Subtracting from 64987974 its reverse (47978946), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 64987974 in words is "sixty-four million, nine hundred eighty-seven thousand, nine hundred seventy-four".