79837621 has 4 divisors (see below), whose sum is σ = 79897644. Its totient is φ = 79777600.

The previous prime is 79837613. The next prime is 79837633. The reversal of 79837621 is 12673897.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12673897 = 23 ⋅551039.

It can be written as a sum of positive squares in 2 ways, for example, as 9696996 + 70140625 = 3114^2 + 8375^2 .

It is a cyclic number.

It is not a de Polignac number, because 79837621 - 2³ = 79837613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79837421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27970 + ... + 30691.

It is an arithmetic number, because the mean of its divisors is an integer number (19974411).

Almost surely, 2^79837621 is an apocalyptic number.

It is an amenable number.

79837621 is a deficient number, since it is larger than the sum of its proper divisors (60023).

79837621 is a wasteful number, since it uses less digits than its factorization.

79837621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60022.

The product of its digits is 127008, while the sum is 43.

The square root of 79837621 is about 8935.1900371509. The cubic root of 79837621 is about 430.5952114157.

The spelling of 79837621 in words is "seventy-nine million, eight hundred thirty-seven thousand, six hundred twenty-one".