99999620 has 24 divisors (see below), whose sum is σ = 239999424. Its totient is φ = 34285536.

The previous prime is 99999617. The next prime is 99999623. The reversal of 99999620 is 2699999.

It is an interprime number because it is at equal distance from previous prime (99999617) and next prime (99999623).

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99999623) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 357002 + ... + 357281.

It is an arithmetic number, because the mean of its divisors is an integer number (9999976).

Almost surely, 2^99999620 is an apocalyptic number.

It is an amenable number.

99999620 is an abundant number, since it is smaller than the sum of its proper divisors (139999804).

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

99999620 is a wasteful number, since it uses less digits than its factorization.

99999620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714299 (or 714297 counting only the distinct ones).

The product of its (nonzero) digits is 708588, while the sum is 53.

The square root of 99999620 is about 9999.9809999819. The cubic root of 99999620 is about 464.1582954259.

The spelling of 99999620 in words is "ninety-nine million, nine hundred ninety-nine thousand, six hundred twenty".