76992521 has 4 divisors (see below), whose sum is σ = 77012292. Its totient is φ = 76972752.

The previous prime is 76992497. The next prime is 76992527. The reversal of 76992521 is 12529967.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12529967 = 2411 ⋅5197.

It can be written as a sum of positive squares in 2 ways, for example, as 64176121 + 12816400 = 8011^2 + 3580^2 .

It is a cyclic number.

It is not a de Polignac number, because 76992521 - 2⁶ = 76992457 is a prime.

It is a Duffinian number.

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (76992527) 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, 1886 + ... + 12551.

It is an arithmetic number, because the mean of its divisors is an integer number (19253073).

Almost surely, 2^76992521 is an apocalyptic number.

It is an amenable number.

76992521 is a deficient number, since it is larger than the sum of its proper divisors (19771).

76992521 is a wasteful number, since it uses less digits than its factorization.

76992521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19770.

The product of its digits is 68040, while the sum is 41.

The square root of 76992521 is about 8774.5382214678. The cubic root of 76992521 is about 425.4183120111.

The spelling of 76992521 in words is "seventy-six million, nine hundred ninety-two thousand, five hundred twenty-one".