79866810 has 96 divisors (see below), whose sum is σ = 224864640. Its totient is φ = 20357568.

The previous prime is 79866791. The next prime is 79866817. The reversal of 79866810 is 1866897.

It is a happy number.

It is a super-2 number, since 2×79866810² = 12757414679152200, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (79866817) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55176 + ... + 56604.

It is an arithmetic number, because the mean of its divisors is an integer number (2342340).

Almost surely, 2^79866810 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79866810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112432320).

79866810 is an abundant number, since it is smaller than the sum of its proper divisors (144997830).

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

79866810 is a wasteful number, since it uses less digits than its factorization.

79866810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474 (or 1462 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 79866810 is about 8936.8232610923. The cubic root of 79866810 is about 430.6476808825.

The spelling of 79866810 in words is "seventy-nine million, eight hundred sixty-six thousand, eight hundred ten".