79543890 has 64 divisors (see below), whose sum is σ = 221356800. Its totient is φ = 20287872.

The previous prime is 79543879. The next prime is 79543903. The reversal of 79543890 is 9834597.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195 + ... + 12614.

It is an arithmetic number, because the mean of its divisors is an integer number (3458700).

Almost surely, 2^79543890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79543890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110678400).

79543890 is an abundant number, since it is smaller than the sum of its proper divisors (141812910).

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

79543890 is a wasteful number, since it uses less digits than its factorization.

79543890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12848 (or 12842 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 79543890 is about 8918.7381394455. The cubic root of 79543890 is about 430.0664941338.

The spelling of 79543890 in words is "seventy-nine million, five hundred forty-three thousand, eight hundred ninety".