99979960 has 32 divisors (see below), whose sum is σ = 232214400. Its totient is φ = 38701440.

The previous prime is 99979933. The next prime is 99979961. The reversal of 99979960 is 6997999.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 99979895 and 99979904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99979961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39075 + ... + 41554.

It is an arithmetic number, because the mean of its divisors is an integer number (7256700).

Almost surely, 2^99979960 is an apocalyptic number.

It is an amenable number.

99979960 is an abundant number, since it is smaller than the sum of its proper divisors (132234440).

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

99979960 is a wasteful number, since it uses less digits than its factorization.

99979960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80671 (or 80667 counting only the distinct ones).

The product of its (nonzero) digits is 2480058, while the sum is 58.

The square root of 99979960 is about 9998.9979497948. The cubic root of 99979960 is about 464.1278754765.

The spelling of 99979960 in words is "ninety-nine million, nine hundred seventy-nine thousand, nine hundred sixty".