99664778 has 24 divisors (see below), whose sum is σ = 160935012. Its totient is φ = 46130304.

The previous prime is 99664777. The next prime is 99664801. The reversal of 99664778 is 87746699.

It can be written as a sum of positive squares in 2 ways, for example, as 99660289 + 4489 = 9983^2 + 67^2 .

It is not an unprimeable number, because it can be changed into a prime (99664777) 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 11 ways as a sum of consecutive naturals, for example, 152300 + ... + 152952.

Almost surely, 2^99664778 is an apocalyptic number.

99664778 is a deficient number, since it is larger than the sum of its proper divisors (61270234).

99664778 is a wasteful number, since it uses less digits than its factorization.

99664778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806 (or 739 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 56.

The square root of 99664778 is about 9983.2248296830. The cubic root of 99664778 is about 463.6396485012.

The spelling of 99664778 in words is "ninety-nine million, six hundred sixty-four thousand, seven hundred seventy-eight".