99564778 has 4 divisors (see below), whose sum is σ = 149347170. Its totient is φ = 49782388.

The previous prime is 99564757. The next prime is 99564797. The reversal of 99564778 is 87746599.

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

It can be written as a sum of positive squares in only one way, i.e., 63888049 + 35676729 = 7993^2 + 5973^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24891193 + ... + 24891196.

Almost surely, 2^99564778 is an apocalyptic number.

99564778 is a deficient number, since it is larger than the sum of its proper divisors (49782392).

99564778 is a wasteful number, since it uses less digits than its factorization.

99564778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49782391.

The product of its digits is 3810240, while the sum is 55.

The square root of 99564778 is about 9978.2151710614. The cubic root of 99564778 is about 463.4845302435.

The spelling of 99564778 in words is "ninety-nine million, five hundred sixty-four thousand, seven hundred seventy-eight".