76646521 has 4 divisors (see below), whose sum is σ = 87596032. Its totient is φ = 65697012.

The previous prime is 76646509. The next prime is 76646527. The reversal of 76646521 is 12564667.

It is a happy number.

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 76646521 - 2¹¹ = 76644473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76646527) 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, 5474745 + ... + 5474758.

It is an arithmetic number, because the mean of its divisors is an integer number (21899008).

Almost surely, 2^76646521 is an apocalyptic number.

It is an amenable number.

76646521 is a deficient number, since it is larger than the sum of its proper divisors (10949511).

76646521 is a wasteful number, since it uses less digits than its factorization.

76646521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10949510.

The product of its digits is 60480, while the sum is 37.

The square root of 76646521 is about 8754.7998834925. The cubic root of 76646521 is about 424.7800864574.

The spelling of 76646521 in words is "seventy-six million, six hundred forty-six thousand, five hundred twenty-one".