64920769 has 2 divisors, whose sum is σ = 64920770. Its totient is φ = 64920768.

The previous prime is 64920733. The next prime is 64920787. The reversal of 64920769 is 96702946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56070144 + 8850625 = 7488^2 + 2975^2 .

It is a cyclic number.

It is not a de Polignac number, because 64920769 - 2²¹ = 62823617 is a prime.

It is a super-2 number, since 2×64920769² = 8429412495102722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64920719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32460384 + 32460385.

It is an arithmetic number, because the mean of its divisors is an integer number (32460385).

Almost surely, 2^64920769 is an apocalyptic number.

It is an amenable number.

64920769 is a deficient number, since it is larger than the sum of its proper divisors (1).

64920769 is an equidigital number, since it uses as much as digits as its factorization.

64920769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 64920769 is about 8057.3425519833. The cubic root of 64920769 is about 401.9091421934.

The spelling of 64920769 in words is "sixty-four million, nine hundred twenty thousand, seven hundred sixty-nine".