76533721 has 4 divisors (see below), whose sum is σ = 83491344. Its totient is φ = 69576100.

The previous prime is 76533713. The next prime is 76533727. The reversal of 76533721 is 12733567.

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 76533721 - 2³ = 76533713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76533727) 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, 3478795 + ... + 3478816.

It is an arithmetic number, because the mean of its divisors is an integer number (20872836).

Almost surely, 2^76533721 is an apocalyptic number.

It is an amenable number.

76533721 is a deficient number, since it is larger than the sum of its proper divisors (6957623).

76533721 is a wasteful number, since it uses less digits than its factorization.

76533721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6957622.

The product of its digits is 26460, while the sum is 34.

The square root of 76533721 is about 8748.3553311465. The cubic root of 76533721 is about 424.5716024636.

The spelling of 76533721 in words is "seventy-six million, five hundred thirty-three thousand, seven hundred twenty-one".