76406521 has 4 divisors (see below), whose sum is σ = 76459392. Its totient is φ = 76353652.

The previous prime is 76406513. The next prime is 76406531. The reversal of 76406521 is 12560467.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12560467 = 17 ⋅738851.

It is a cyclic number.

It is not a de Polignac number, because 76406521 - 2³ = 76406513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76406531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24205 + ... + 27178.

It is an arithmetic number, because the mean of its divisors is an integer number (19114848).

Almost surely, 2^76406521 is an apocalyptic number.

It is an amenable number.

76406521 is a deficient number, since it is larger than the sum of its proper divisors (52871).

76406521 is a wasteful number, since it uses less digits than its factorization.

76406521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52870.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 76406521 is about 8741.0823700501. The cubic root of 76406521 is about 424.3362575983.

Adding to 76406521 its reverse (12560467), we get a palindrome (88966988).

It can be divided in two parts, 7640 and 6521, that added together give a square (14161 = 119²).

The spelling of 76406521 in words is "seventy-six million, four hundred six thousand, five hundred twenty-one".