80924721 has 4 divisors (see below), whose sum is σ = 107899632. Its totient is φ = 53949812.

The previous prime is 80924717. The next prime is 80924747. The reversal of 80924721 is 12742908.

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.

It is a cyclic number.

It is not a de Polignac number, because 80924721 - 2² = 80924717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80924791) 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, 13487451 + ... + 13487456.

It is an arithmetic number, because the mean of its divisors is an integer number (26974908).

Almost surely, 2^80924721 is an apocalyptic number.

It is an amenable number.

80924721 is a deficient number, since it is larger than the sum of its proper divisors (26974911).

80924721 is a wasteful number, since it uses less digits than its factorization.

80924721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26974910.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 80924721 is about 8995.8168611861. The cubic root of 80924721 is about 432.5407911453.

The spelling of 80924721 in words is "eighty million, nine hundred twenty-four thousand, seven hundred twenty-one".