99907428 has 12 divisors (see below), whose sum is σ = 233117360. Its totient is φ = 33302472.

The previous prime is 99907417. The next prime is 99907463. The reversal of 99907428 is 82470999.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4162798 + ... + 4162821.

Almost surely, 2^99907428 is an apocalyptic number.

It is an amenable number.

99907428 is an abundant number, since it is smaller than the sum of its proper divisors (133209932).

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

99907428 is a wasteful number, since it uses less digits than its factorization.

99907428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8325626 (or 8325624 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 99907428 is about 9995.3703283070. The cubic root of 99907428 is about 464.0156120886.

The spelling of 99907428 in words is "ninety-nine million, nine hundred seven thousand, four hundred twenty-eight".