99957779 has 4 divisors (see below), whose sum is σ = 100110120. Its totient is φ = 99805440.

The previous prime is 99957761. The next prime is 99957787. The reversal of 99957779 is 97775999.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99957779 - 2²⁴ = 83180563 is a prime.

It is a super-2 number, since 2×99957779² = 19983115165225682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99957709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75182 + ... + 76499.

It is an arithmetic number, because the mean of its divisors is an integer number (25027530).

Almost surely, 2^99957779 is an apocalyptic number.

99957779 is a deficient number, since it is larger than the sum of its proper divisors (152341).

99957779 is a wasteful number, since it uses less digits than its factorization.

99957779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152340.

The product of its digits is 11252115, while the sum is 62.

The square root of 99957779 is about 9997.8887271263. Note that the first 3 decimals coincide. The cubic root of 99957779 is about 464.0935499916.

The spelling of 99957779 in words is "ninety-nine million, nine hundred fifty-seven thousand, seven hundred seventy-nine".