99656387 has 4 divisors (see below), whose sum is σ = 104901480. Its totient is φ = 94411296.

The previous prime is 99656339. The next prime is 99656393. The reversal of 99656387 is 78365699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78365699 = 17 ⋅4609747.

It is a cyclic number.

It is not a de Polignac number, because 99656387 - 2¹⁰ = 99655363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99656087) 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, 2622518 + ... + 2622555.

It is an arithmetic number, because the mean of its divisors is an integer number (26225370).

Almost surely, 2^99656387 is an apocalyptic number.

99656387 is a deficient number, since it is larger than the sum of its proper divisors (5245093).

99656387 is a wasteful number, since it uses less digits than its factorization.

99656387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5245092.

The product of its digits is 2449440, while the sum is 53.

The square root of 99656387 is about 9982.8045658522. The cubic root of 99656387 is about 463.6266365172.

The spelling of 99656387 in words is "ninety-nine million, six hundred fifty-six thousand, three hundred eighty-seven".