99722420 has 24 divisors (see below), whose sum is σ = 239334144. Its totient is φ = 34190496.

The previous prime is 99722407. The next prime is 99722471. The reversal of 99722420 is 2422799.

It is a happy number.

It is a super-2 number, since 2×99722420² = 19889122101312800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356012 + ... + 356291.

It is an arithmetic number, because the mean of its divisors is an integer number (9972256).

Almost surely, 2^99722420 is an apocalyptic number.

It is an amenable number.

99722420 is an abundant number, since it is smaller than the sum of its proper divisors (139611724).

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

99722420 is a wasteful number, since it uses less digits than its factorization.

99722420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712319 (or 712317 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 99722420 is about 9986.1113552774. Note that the first 3 decimals coincide. The cubic root of 99722420 is about 463.7290146296.

The spelling of 99722420 in words is "ninety-nine million, seven hundred twenty-two thousand, four hundred twenty".