65391912 has 24 divisors (see below), whose sum is σ = 177103290. Its totient is φ = 21797280.

The previous prime is 65391869. The next prime is 65391917. The reversal of 65391912 is 21919356.

It can be written as a sum of positive squares in only one way, i.e., 57062916 + 8328996 = 7554^2 + 2886^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×65391912² = 8552204310031488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (65391917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 454039 + ... + 454182.

Almost surely, 2^65391912 is an apocalyptic number.

It is an amenable number.

65391912 is an abundant number, since it is smaller than the sum of its proper divisors (111711378).

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

65391912 is a wasteful number, since it uses less digits than its factorization.

65391912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908233 (or 908226 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 65391912 is about 8086.5265720209. The cubic root of 65391912 is about 402.8790447038.

The spelling of 65391912 in words is "sixty-five million, three hundred ninety-one thousand, nine hundred twelve".