76669921 has 4 divisors (see below), whose sum is σ = 80705200. Its totient is φ = 72634644.

The previous prime is 76669907. The next prime is 76669933. The reversal of 76669921 is 12996667.

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 not a de Polignac number, because 76669921 - 2⁷ = 76669793 is a prime.

It is a super-2 number, since 2×76669921² = 11756553572292482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76669961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2017611 + ... + 2017648.

It is an arithmetic number, because the mean of its divisors is an integer number (20176300).

Almost surely, 2^76669921 is an apocalyptic number.

It is an amenable number.

76669921 is a deficient number, since it is larger than the sum of its proper divisors (4035279).

76669921 is a wasteful number, since it uses less digits than its factorization.

76669921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4035278.

The product of its digits is 244944, while the sum is 46.

The square root of 76669921 is about 8756.1361912661. The cubic root of 76669921 is about 424.8233101747.

The spelling of 76669921 in words is "seventy-six million, six hundred sixty-nine thousand, nine hundred twenty-one".