79878420 has 96 divisors (see below), whose sum is σ = 253290240. Its totient is φ = 20891520.

The previous prime is 79878397. The next prime is 79878437. The reversal of 79878420 is 2487897.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27225 + ... + 30015.

It is an arithmetic number, because the mean of its divisors is an integer number (2638440).

Almost surely, 2^79878420 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 79878420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126645120).

79878420 is an abundant number, since it is smaller than the sum of its proper divisors (173411820).

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

79878420 is a wasteful number, since it uses less digits than its factorization.

79878420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2862 (or 2854 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 79878420 is about 8937.4727971614. The cubic root of 79878420 is about 430.6685471945.

The spelling of 79878420 in words is "seventy-nine million, eight hundred seventy-eight thousand, four hundred twenty".