77564533 has 4 divisors (see below), whose sum is σ = 80936928. Its totient is φ = 74192140.

The previous prime is 77564521. The next prime is 77564551. The reversal of 77564533 is 33546577.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77564533 - 2¹³ = 77556341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77564503) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1686163 + ... + 1686208.

It is an arithmetic number, because the mean of its divisors is an integer number (20234232).

Almost surely, 2^77564533 is an apocalyptic number.

It is an amenable number.

77564533 is a deficient number, since it is larger than the sum of its proper divisors (3372395).

77564533 is a wasteful number, since it uses less digits than its factorization.

77564533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3372394.

The product of its digits is 264600, while the sum is 40.

The square root of 77564533 is about 8807.0728962579. The cubic root of 77564533 is about 426.4692548527.

The spelling of 77564533 in words is "seventy-seven million, five hundred sixty-four thousand, five hundred thirty-three".