99940578 has 16 divisors (see below), whose sum is σ = 200123136. Its totient is φ = 33273200.

The previous prime is 99940573. The next prime is 99940579. The reversal of 99940578 is 87504999.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 99940578.

It is not an unprimeable number, because it can be changed into a prime (99940571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4473 + ... + 14828.

It is an arithmetic number, because the mean of its divisors is an integer number (12507696).

Almost surely, 2^99940578 is an apocalyptic number.

99940578 is an abundant number, since it is smaller than the sum of its proper divisors (100182558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99940578 is a wasteful number, since it uses less digits than its factorization.

99940578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20169.

The product of its (nonzero) digits is 816480, while the sum is 51.

The square root of 99940578 is about 9997.0284584971. The cubic root of 99940578 is about 464.0669276477.

The spelling of 99940578 in words is "ninety-nine million, nine hundred forty thousand, five hundred seventy-eight".