99278999 has 4 divisors (see below), whose sum is σ = 101700480. Its totient is φ = 96857520.

The previous prime is 99278969. The next prime is 99279001. The reversal of 99278999 is 99987299.

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

It is a cyclic number.

It is not a de Polignac number, because 99278999 - 2¹⁶ = 99213463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99278909) 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, 1210679 + ... + 1210760.

It is an arithmetic number, because the mean of its divisors is an integer number (25425120).

Almost surely, 2^99278999 is an apocalyptic number.

99278999 is a deficient number, since it is larger than the sum of its proper divisors (2421481).

99278999 is a wasteful number, since it uses less digits than its factorization.

99278999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2421480.

The product of its digits is 6613488, while the sum is 62.

The square root of 99278999 is about 9963.8847343795. The cubic root of 99278999 is about 463.0406615127.

The spelling of 99278999 in words is "ninety-nine million, two hundred seventy-eight thousand, nine hundred ninety-nine".