79784890 has 16 divisors (see below), whose sum is σ = 144030600. Its totient is φ = 31821120.

The previous prime is 79784867. The next prime is 79784891. The reversal of 79784890 is 9848797.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 79334649 + 450241 = 8907^2 + 671^2 .

It is not an unprimeable number, because it can be changed into a prime (79784891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7941 + ... + 14920.

Almost surely, 2^79784890 is an apocalyptic number.

79784890 is a deficient number, since it is larger than the sum of its proper divisors (64245710).

79784890 is a wasteful number, since it uses less digits than its factorization.

79784890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23217.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 79784890 is about 8932.2388011069. The cubic root of 79784890 is about 430.5003909684.

The spelling of 79784890 in words is "seventy-nine million, seven hundred eighty-four thousand, eight hundred ninety".