99978049 has 4 divisors (see below), whose sum is σ = 102416580. Its totient is φ = 97539520.

The previous prime is 99978041. The next prime is 99978059. The reversal of 99978049 is 94087999.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23590449 + 76387600 = 4857^2 + 8740^2 .

It is a cyclic number.

It is not a de Polignac number, because 99978049 - 2³ = 99978041 is a prime.

It is a super-2 number, since 2×99978049² = 19991220563692802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99978041) 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, 1219204 + ... + 1219285.

It is an arithmetic number, because the mean of its divisors is an integer number (25604145).

Almost surely, 2^99978049 is an apocalyptic number.

It is an amenable number.

99978049 is a deficient number, since it is larger than the sum of its proper divisors (2438531).

99978049 is a wasteful number, since it uses less digits than its factorization.

99978049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2438530.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The square root of 99978049 is about 9998.9023897626. The cubic root of 99978049 is about 464.1249183704.

The spelling of 99978049 in words is "ninety-nine million, nine hundred seventy-eight thousand, forty-nine".