65939864 has 16 divisors (see below), whose sum is σ = 123723600. Its totient is φ = 32946912.

The previous prime is 65939851. The next prime is 65939869. The reversal of 65939864 is 46893956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65939869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19877 + ... + 22955.

It is an arithmetic number, because the mean of its divisors is an integer number (7732725).

Almost surely, 2^65939864 is an apocalyptic number.

It is an amenable number.

65939864 is a deficient number, since it is larger than the sum of its proper divisors (57783736).

65939864 is a wasteful number, since it uses less digits than its factorization.

65939864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5762 (or 5758 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 50.

The square root of 65939864 is about 8120.3364462318. The cubic root of 65939864 is about 404.0012253663.

It can be divided in two parts, 659 and 39864, that multiplied together give a triangular number (26270376 = T₇₂₄₈).

The spelling of 65939864 in words is "sixty-five million, nine hundred thirty-nine thousand, eight hundred sixty-four".