76403721 has 4 divisors (see below), whose sum is σ = 101871632. Its totient is φ = 50935812.

The previous prime is 76403689. The next prime is 76403783. The reversal of 76403721 is 12730467.

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 76403721 - 2⁵ = 76403689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76404721) 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, 12733951 + ... + 12733956.

It is an arithmetic number, because the mean of its divisors is an integer number (25467908).

Almost surely, 2^76403721 is an apocalyptic number.

It is an amenable number.

76403721 is a deficient number, since it is larger than the sum of its proper divisors (25467911).

76403721 is a wasteful number, since it uses less digits than its factorization.

76403721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25467910.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 76403721 is about 8740.9222053511. The cubic root of 76403721 is about 424.3310741139.

The spelling of 76403721 in words is "seventy-six million, four hundred three thousand, seven hundred twenty-one".