99778508 has 48 divisors (see below), whose sum is σ = 194793984. Its totient is φ = 44478720.

The previous prime is 99778507. The next prime is 99778537. The reversal of 99778508 is 80587799.

It is a self number, because there is not a number n which added to its sum of digits gives 99778508.

It is not an unprimeable number, because it can be changed into a prime (99778507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204641 + ... + 205127.

It is an arithmetic number, because the mean of its divisors is an integer number (4058208).

Almost surely, 2^99778508 is an apocalyptic number.

It is an amenable number.

99778508 is a deficient number, since it is larger than the sum of its proper divisors (95015476).

99778508 is a wasteful number, since it uses less digits than its factorization.

99778508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 53.

The square root of 99778508 is about 9988.9192608610. The cubic root of 99778508 is about 463.8159384400.

The spelling of 99778508 in words is "ninety-nine million, seven hundred seventy-eight thousand, five hundred eight".