76631721 has 8 divisors (see below), whose sum is σ = 105471744. Its totient is φ = 49439760.

The previous prime is 76631701. The next prime is 76631749. The reversal of 76631721 is 12713667.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 76631721 - 2⁵ = 76631689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (76631701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411906 + ... + 412091.

It is an arithmetic number, because the mean of its divisors is an integer number (13183968).

Almost surely, 2^76631721 is an apocalyptic number.

It is an amenable number.

76631721 is a deficient number, since it is larger than the sum of its proper divisors (28840023).

76631721 is a wasteful number, since it uses less digits than its factorization.

76631721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824031.

The product of its digits is 10584, while the sum is 33.

The square root of 76631721 is about 8753.9545920687. The cubic root of 76631721 is about 424.7527438380.

The spelling of 76631721 in words is "seventy-six million, six hundred thirty-one thousand, seven hundred twenty-one".