64796779 has 4 divisors (see below), whose sum is σ = 64929240. Its totient is φ = 64664320.

The previous prime is 64796761. The next prime is 64796791. The reversal of 64796779 is 97769746.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97769746 = 2 ⋅48884873.

It is a cyclic number.

It is not a de Polignac number, because 64796779 - 2²⁵ = 31242347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64796729) 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, 65494 + ... + 66475.

It is an arithmetic number, because the mean of its divisors is an integer number (16232310).

Almost surely, 2^64796779 is an apocalyptic number.

64796779 is a deficient number, since it is larger than the sum of its proper divisors (132461).

64796779 is a wasteful number, since it uses less digits than its factorization.

64796779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132460.

The product of its digits is 4000752, while the sum is 55.

The square root of 64796779 is about 8049.6446505420. The cubic root of 64796779 is about 401.6531148664.

The spelling of 64796779 in words is "sixty-four million, seven hundred ninety-six thousand, seven hundred seventy-nine".