99720879 has 8 divisors (see below), whose sum is σ = 137546160. Its totient is φ = 64188096.

The previous prime is 99720871. The next prime is 99720889. The reversal of 99720879 is 97802799.

It is a happy number.

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

It is not a de Polignac number, because 99720879 - 2³ = 99720871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99720871) 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, 573022 + ... + 573195.

It is an arithmetic number, because the mean of its divisors is an integer number (17193270).

Almost surely, 2^99720879 is an apocalyptic number.

99720879 is a deficient number, since it is larger than the sum of its proper divisors (37825281).

99720879 is a wasteful number, since it uses less digits than its factorization.

99720879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146249.

The product of its (nonzero) digits is 571536, while the sum is 51.

The square root of 99720879 is about 9986.0341978185. The cubic root of 99720879 is about 463.7266259655.

The spelling of 99720879 in words is "ninety-nine million, seven hundred twenty thousand, eight hundred seventy-nine".