65390657 has 4 divisors (see below), whose sum is σ = 65807316. Its totient is φ = 64974000.

The previous prime is 65390651. The next prime is 65390671. The reversal of 65390657 is 75609356.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20647936 + 44742721 = 4544^2 + 6689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65390657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65390651) 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, 208094 + ... + 208407.

It is an arithmetic number, because the mean of its divisors is an integer number (16451829).

Almost surely, 2^65390657 is an apocalyptic number.

It is an amenable number.

65390657 is a deficient number, since it is larger than the sum of its proper divisors (416659).

65390657 is a wasteful number, since it uses less digits than its factorization.

65390657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416658.

The product of its (nonzero) digits is 170100, while the sum is 41.

The square root of 65390657 is about 8086.4489734370. The cubic root of 65390657 is about 402.8764673390.

The spelling of 65390657 in words is "sixty-five million, three hundred ninety thousand, six hundred fifty-seven".