99412720 has 80 divisors (see below), whose sum is σ = 253992672. Its totient is φ = 35886080.

The previous prime is 99412717. The next prime is 99412721. The reversal of 99412720 is 2721499.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99412721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151914 + ... + 152566.

Almost surely, 2^99412720 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 99412720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126996336).

99412720 is an abundant number, since it is smaller than the sum of its proper divisors (154579952).

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

99412720 is a wasteful number, since it uses less digits than its factorization.

99412720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850 (or 844 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 99412720 is about 9970.5927607139. The cubic root of 99412720 is about 463.2484613563.

The spelling of 99412720 in words is "ninety-nine million, four hundred twelve thousand, seven hundred twenty".