65731938 has 16 divisors (see below), whose sum is σ = 134670816. Its totient is φ = 21376160.

The previous prime is 65731879. The next prime is 65731949. The reversal of 65731938 is 83913756.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 65731938.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133356 + ... + 133847.

It is an arithmetic number, because the mean of its divisors is an integer number (8416926).

Almost surely, 2^65731938 is an apocalyptic number.

65731938 is an abundant number, since it is smaller than the sum of its proper divisors (68938878).

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

65731938 is a wasteful number, since it uses less digits than its factorization.

65731938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267249.

The product of its digits is 136080, while the sum is 42.

The square root of 65731938 is about 8107.5235429815. The cubic root of 65731938 is about 403.5761369972.

The spelling of 65731938 in words is "sixty-five million, seven hundred thirty-one thousand, nine hundred thirty-eight".