79540621 has 4 divisors (see below), whose sum is σ = 79560252. Its totient is φ = 79520992.

The previous prime is 79540589. The next prime is 79540667. The reversal of 79540621 is 12604597.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48860100 + 30680521 = 6990^2 + 5539^2 .

It is a cyclic number.

It is not a de Polignac number, because 79540621 - 2⁵ = 79540589 is a prime.

It is a super-4 number, since 4×79540621⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79540421) 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, 1240 + ... + 12673.

It is an arithmetic number, because the mean of its divisors is an integer number (19890063).

Almost surely, 2^79540621 is an apocalyptic number.

It is an amenable number.

79540621 is a deficient number, since it is larger than the sum of its proper divisors (19631).

79540621 is a wasteful number, since it uses less digits than its factorization.

79540621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19630.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 79540621 is about 8918.5548717267. The cubic root of 79540621 is about 430.0606025997.

The spelling of 79540621 in words is "seventy-nine million, five hundred forty thousand, six hundred twenty-one".