99978051 has 16 divisors (see below), whose sum is σ = 138160800. Its totient is φ = 64232448.

The previous prime is 99978041. The next prime is 99978059. The reversal of 99978051 is 15087999.

It is not a de Polignac number, because 99978051 - 2⁷ = 99977923 is a prime.

It is a super-2 number, since 2×99978051² = 19991221363517202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99978059) 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, 80205 + ... + 81441.

It is an arithmetic number, because the mean of its divisors is an integer number (8635050).

Almost surely, 2^99978051 is an apocalyptic number.

99978051 is a deficient number, since it is larger than the sum of its proper divisors (38182749).

99978051 is a wasteful number, since it uses less digits than its factorization.

99978051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198.

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 99978051 is about 9998.9024897736. The cubic root of 99978051 is about 464.1249214653.

The spelling of 99978051 in words is "ninety-nine million, nine hundred seventy-eight thousand, fifty-one".