65400079 has 4 divisors (see below), whose sum is σ = 65442384. Its totient is φ = 65357776.

The previous prime is 65400073. The next prime is 65400089. The reversal of 65400079 is 97000456.

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

It is a cyclic number.

It is not a de Polignac number, because 65400079 - 2²⁵ = 31845647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65400079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65400073) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 18742 + ... + 21955.

It is an arithmetic number, because the mean of its divisors is an integer number (16360596).

Almost surely, 2^65400079 is an apocalyptic number.

65400079 is a deficient number, since it is larger than the sum of its proper divisors (42305).

65400079 is a wasteful number, since it uses less digits than its factorization.

65400079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42304.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 65400079 is about 8087.0315320271. The cubic root of 65400079 is about 402.8958162794.

The spelling of 65400079 in words is "sixty-five million, four hundred thousand, seventy-nine".