99920628 has 72 divisors (see below), whose sum is σ = 277385472. Its totient is φ = 31342464.

The previous prime is 99920603. The next prime is 99920641. The reversal of 99920628 is 82602999.

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, 13501 + ... + 19547.

It is an arithmetic number, because the mean of its divisors is an integer number (3852576).

Almost surely, 2^99920628 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 99920628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138692736).

99920628 is an abundant number, since it is smaller than the sum of its proper divisors (177464844).

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

99920628 is a wasteful number, since it uses less digits than its factorization.

99920628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6083 (or 6069 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 99920628 is about 9996.0306121980. The cubic root of 99920628 is about 464.0360467933.

The spelling of 99920628 in words is "ninety-nine million, nine hundred twenty thousand, six hundred twenty-eight".