76564421 has 4 divisors (see below), whose sum is σ = 76584012. Its totient is φ = 76544832.

The previous prime is 76564417. The next prime is 76564441. The reversal of 76564421 is 12446567.

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 74632321 + 1932100 = 8639^2 + 1390^2 .

It is a cyclic number.

It is not a de Polignac number, because 76564421 - 2² = 76564417 is a prime.

It is a super-2 number, since 2×76564421² = 11724221126130482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76564441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1706 + ... + 12491.

It is an arithmetic number, because the mean of its divisors is an integer number (19146003).

Almost surely, 2^76564421 is an apocalyptic number.

It is an amenable number.

76564421 is a deficient number, since it is larger than the sum of its proper divisors (19591).

76564421 is a wasteful number, since it uses less digits than its factorization.

76564421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19590.

The product of its digits is 40320, while the sum is 35.

The square root of 76564421 is about 8750.1097707400. The cubic root of 76564421 is about 424.6283643963.

The spelling of 76564421 in words is "seventy-six million, five hundred sixty-four thousand, four hundred twenty-one".