79084721 has 4 divisors (see below), whose sum is σ = 80425200. Its totient is φ = 77744244.

The previous prime is 79084693. The next prime is 79084763. The reversal of 79084721 is 12748097.

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 79084721 - 2¹⁴ = 79068337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79084781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670151 + ... + 670268.

It is an arithmetic number, because the mean of its divisors is an integer number (20106300).

Almost surely, 2^79084721 is an apocalyptic number.

It is an amenable number.

79084721 is a deficient number, since it is larger than the sum of its proper divisors (1340479).

79084721 is a wasteful number, since it uses less digits than its factorization.

79084721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340478.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 79084721 is about 8892.9590688364. The cubic root of 79084721 is about 429.2373736812.

The spelling of 79084721 in words is "seventy-nine million, eighty-four thousand, seven hundred twenty-one".