79998786 has 64 divisors (see below), whose sum is σ = 209756160. Its totient is φ = 22116240.

The previous prime is 79998781. The next prime is 79998823. The reversal of 79998786 is 68789997.

It is a super-2 number, since 2×79998786² = 12799611522947592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (79998781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8305 + ... + 15131.

It is an arithmetic number, because the mean of its divisors is an integer number (3277440).

Almost surely, 2^79998786 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79998786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104878080).

79998786 is an abundant number, since it is smaller than the sum of its proper divisors (129757374).

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

79998786 is a wasteful number, since it uses less digits than its factorization.

79998786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876 (or 6870 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The square root of 79998786 is about 8944.2040450786. The cubic root of 79998786 is about 430.8847584256.

The spelling of 79998786 in words is "seventy-nine million, nine hundred ninety-eight thousand, seven hundred eighty-six".