65391944 has 32 divisors (see below), whose sum is σ = 128502720. Its totient is φ = 31137216.

The previous prime is 65391943. The next prime is 65391947. The reversal of 65391944 is 44919356.

It is a super-2 number, since 2×65391944² = 8552212680198272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (65391943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50327 + ... + 51609.

It is an arithmetic number, because the mean of its divisors is an integer number (4015710).

Almost surely, 2^65391944 is an apocalyptic number.

It is an amenable number.

65391944 is a deficient number, since it is larger than the sum of its proper divisors (63110776).

65391944 is a wasteful number, since it uses less digits than its factorization.

65391944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589 (or 1585 counting only the distinct ones).

The product of its digits is 116640, while the sum is 41.

The square root of 65391944 is about 8086.5285506205. The cubic root of 65391944 is about 402.8791104210.

The spelling of 65391944 in words is "sixty-five million, three hundred ninety-one thousand, nine hundred forty-four".