99145978 has 8 divisors (see below), whose sum is σ = 148890420. Its totient is φ = 49515840.

The previous prime is 99145961. The next prime is 99145993. The reversal of 99145978 is 87954199.

It can be written as a sum of positive squares in 2 ways, for example, as 96177249 + 2968729 = 9807^2 + 1723^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26373 + ... + 29896.

Almost surely, 2^99145978 is an apocalyptic number.

99145978 is a deficient number, since it is larger than the sum of its proper divisors (49744442).

99145978 is a wasteful number, since it uses less digits than its factorization.

99145978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57152.

The product of its digits is 816480, while the sum is 52.

The square root of 99145978 is about 9957.2073394100. The cubic root of 99145978 is about 462.8337642422.

The spelling of 99145978 in words is "ninety-nine million, one hundred forty-five thousand, nine hundred seventy-eight".