99977864 has 16 divisors (see below), whose sum is σ = 214238400. Its totient is φ = 42847632.

The previous prime is 99977863. The next prime is 99977873. The reversal of 99977864 is 46877999.

It is not an unprimeable number, because it can be changed into a prime (99977861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892604 + ... + 892715.

It is an arithmetic number, because the mean of its divisors is an integer number (13389900).

Almost surely, 2^99977864 is an apocalyptic number.

It is an amenable number.

99977864 is an abundant number, since it is smaller than the sum of its proper divisors (114260536).

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

99977864 is a wasteful number, since it uses less digits than its factorization.

99977864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785332 (or 1785328 counting only the distinct ones).

The product of its digits is 6858432, while the sum is 59.

The square root of 99977864 is about 9998.8931387429. The cubic root of 99977864 is about 464.1246320971.

The spelling of 99977864 in words is "ninety-nine million, nine hundred seventy-seven thousand, eight hundred sixty-four".