79851420 has 120 divisors (see below), whose sum is σ = 273330288. Its totient is φ = 19353600.

The previous prime is 79851419. The next prime is 79851451. The reversal of 79851420 is 2415897.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 15580 + ... + 20060.

Almost surely, 2^79851420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79851420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136665144).

79851420 is an abundant number, since it is smaller than the sum of its proper divisors (193478868).

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

79851420 is a wasteful number, since it uses less digits than its factorization.

79851420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4513 (or 4502 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 79851420 is about 8935.9621753900. The cubic root of 79851420 is about 430.6200177704.

The spelling of 79851420 in words is "seventy-nine million, eight hundred fifty-one thousand, four hundred twenty".