79221556 has 6 divisors (see below), whose sum is σ = 138637730. Its totient is φ = 39610776.

The previous prime is 79221509. The next prime is 79221557. The reversal of 79221556 is 65512297.

It can be written as a sum of positive squares in only one way, i.e., 44222500 + 34999056 = 6650^2 + 5916^2 .

It is a super-2 number, since 2×79221556² = 12552109870122272, which contains 22 as substring.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9902691 + ... + 9902698.

Almost surely, 2^79221556 is an apocalyptic number.

It is an amenable number.

79221556 is a deficient number, since it is larger than the sum of its proper divisors (59416174).

79221556 is a wasteful number, since it uses less digits than its factorization.

79221556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19805393 (or 19805391 counting only the distinct ones).

The product of its digits is 37800, while the sum is 37.

The square root of 79221556 is about 8900.6491898063. The cubic root of 79221556 is about 429.4847912730.

The spelling of 79221556 in words is "seventy-nine million, two hundred twenty-one thousand, five hundred fifty-six".