99775980 has 72 divisors (see below), whose sum is σ = 312434304. Its totient is φ = 25747200.

The previous prime is 99775961. The next prime is 99775993. The reversal of 99775980 is 8957799.

It is a super-3 number, since 3×99775980³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3361 + ... + 14520.

Almost surely, 2^99775980 is an apocalyptic number.

99775980 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99775980 is an abundant number, since it is smaller than the sum of its proper divisors (212658324).

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

99775980 is a wasteful number, since it uses less digits than its factorization.

99775980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17927 (or 17922 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 54.

The square root of 99775980 is about 9988.7927198436. The cubic root of 99775980 is about 463.8120213086.

The spelling of 99775980 in words is "ninety-nine million, seven hundred seventy-five thousand, nine hundred eighty".