79221555 has 48 divisors (see below), whose sum is σ = 160303104. Its totient is φ = 35438400.

The previous prime is 79221509. The next prime is 79221557. The reversal of 79221555 is 55512297.

It is not a de Polignac number, because 79221555 - 2⁶ = 79221491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79221557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12130 + ... + 17480.

It is an arithmetic number, because the mean of its divisors is an integer number (3339648).

Almost surely, 2^79221555 is an apocalyptic number.

79221555 is an abundant number, since it is smaller than the sum of its proper divisors (81081549).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79221555 is a wasteful number, since it uses less digits than its factorization.

79221555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5416 (or 5413 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 79221555 is about 8900.6491336306. The cubic root of 79221555 is about 429.4847894659.

The spelling of 79221555 in words is "seventy-nine million, two hundred twenty-one thousand, five hundred fifty-five".