79921212 has 48 divisors (see below), whose sum is σ = 213561600. Its totient is φ = 22787712.

The previous prime is 79921211. The next prime is 79921271. The reversal of 79921212 is 21212997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79921211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75664 + ... + 76712.

It is an arithmetic number, because the mean of its divisors is an integer number (4449200).

Almost surely, 2^79921212 is an apocalyptic number.

It is an amenable number.

79921212 is an abundant number, since it is smaller than the sum of its proper divisors (133640388).

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

79921212 is a wasteful number, since it uses less digits than its factorization.

79921212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970 (or 1968 counting only the distinct ones).

The product of its digits is 4536, while the sum is 33.

The square root of 79921212 is about 8939.8664419554. The cubic root of 79921212 is about 430.7454385440.

The spelling of 79921212 in words is "seventy-nine million, nine hundred twenty-one thousand, two hundred twelve".