79279991 has 16 divisors (see below), whose sum is σ = 93038400. Its totient is φ = 67525920.

The previous prime is 79279979. The next prime is 79280041. The reversal of 79279991 is 19997297.

It is not a de Polignac number, because 79279991 - 2¹⁰ = 79278967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79279391) 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, 61445 + ... + 62721.

It is an arithmetic number, because the mean of its divisors is an integer number (5814900).

Almost surely, 2^79279991 is an apocalyptic number.

79279991 is a deficient number, since it is larger than the sum of its proper divisors (13758409).

79279991 is a wasteful number, since it uses less digits than its factorization.

79279991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1479 (or 1465 counting only the distinct ones).

The product of its digits is 642978, while the sum is 53.

The square root of 79279991 is about 8903.9312104261. The cubic root of 79279991 is about 429.5903634469.

The spelling of 79279991 in words is "seventy-nine million, two hundred seventy-nine thousand, nine hundred ninety-one".