79223540 has 72 divisors (see below), whose sum is σ = 192605280. Its totient is φ = 27276480.

The previous prime is 79223539. The next prime is 79223561. The reversal of 79223540 is 4532297.

It is a happy number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 79223497 and 79223506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45119 + ... + 46841.

Almost surely, 2^79223540 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 79223540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96302640).

79223540 is an abundant number, since it is smaller than the sum of its proper divisors (113381740).

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

79223540 is a wasteful number, since it uses less digits than its factorization.

79223540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773 (or 1760 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 79223540 is about 8900.7606416530. The cubic root of 79223540 is about 429.4883765375.

The spelling of 79223540 in words is "seventy-nine million, two hundred twenty-three thousand, five hundred forty".