99979555 has 24 divisors (see below), whose sum is σ = 130837680. Its totient is φ = 73307520.

The previous prime is 99979553. The next prime is 99979591. The reversal of 99979555 is 55597999.

It is not a de Polignac number, because 99979555 - 2¹ = 99979553 is a prime.

It is a super-2 number, since 2×99979555² = 19991822835996050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99979555.

It is not an unprimeable number, because it can be changed into a prime (99979553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150925 + ... + 151585.

It is an arithmetic number, because the mean of its divisors is an integer number (5451570).

Almost surely, 2^99979555 is an apocalyptic number.

99979555 is a deficient number, since it is larger than the sum of its proper divisors (30858125).

99979555 is a wasteful number, since it uses less digits than its factorization.

99979555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871 (or 858 counting only the distinct ones).

The product of its digits is 5740875, while the sum is 58.

The square root of 99979555 is about 9998.9776977449. The cubic root of 99979555 is about 464.1272487774.

The spelling of 99979555 in words is "ninety-nine million, nine hundred seventy-nine thousand, five hundred fifty-five".