79871994 has 40 divisors (see below), whose sum is σ = 179837460. Its totient is φ = 26495424.

The previous prime is 79871929. The next prime is 79872019. The reversal of 79871994 is 49917897.

It can be written as a sum of positive squares in 2 ways, for example, as 79869969 + 2025 = 8937^2 + 45^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 79871994.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 36022 + ... + 38174.

Almost surely, 2^79871994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79871994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89918730).

79871994 is an abundant number, since it is smaller than the sum of its proper divisors (99965466).

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

79871994 is a wasteful number, since it uses less digits than its factorization.

79871994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396 (or 2387 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 79871994 is about 8937.1132923333. The cubic root of 79871994 is about 430.6569981833.

The spelling of 79871994 in words is "seventy-nine million, eight hundred seventy-one thousand, nine hundred ninety-four".