99997880 has 16 divisors (see below), whose sum is σ = 224995320. Its totient is φ = 39999136.

The previous prime is 99997879. The next prime is 99997897. The reversal of 99997880 is 8879999.

It is a congruent number.

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, 1249934 + ... + 1250013.

Almost surely, 2^99997880 is an apocalyptic number.

It is an amenable number.

99997880 is an abundant number, since it is smaller than the sum of its proper divisors (124997440).

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

99997880 is a wasteful number, since it uses less digits than its factorization.

99997880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2499958 (or 2499954 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 59.

The square root of 99997880 is about 9999.8939994382. The cubic root of 99997880 is about 464.1556032820.

The spelling of 99997880 in words is "ninety-nine million, nine hundred ninety-seven thousand, eight hundred eighty".