99978896 has 20 divisors (see below), whose sum is σ = 193920252. Its totient is φ = 49934976.

The previous prime is 99978883. The next prime is 99978899. The reversal of 99978896 is 69887999.

It can be written as a sum of positive squares in 2 ways, for example, as 83978896 + 16000000 = 9164^2 + 4000^2 .

It is not an unprimeable number, because it can be changed into a prime (99978899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14630 + ... + 20346.

Almost surely, 2^99978896 is an apocalyptic number.

It is an amenable number.

99978896 is a deficient number, since it is larger than the sum of its proper divisors (93941356).

99978896 is a wasteful number, since it uses less digits than its factorization.

99978896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6818 (or 6812 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 65.

The square root of 99978896 is about 9998.9447443218. The cubic root of 99978896 is about 464.1262290338.

The spelling of 99978896 in words is "ninety-nine million, nine hundred seventy-eight thousand, eight hundred ninety-six".