99772579 has 4 divisors (see below), whose sum is σ = 100500984. Its totient is φ = 99044176.

The previous prime is 99772573. The next prime is 99772633. The reversal of 99772579 is 97527799.

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 99772579 - 2³ = 99772571 is a prime.

It is a super-2 number, since 2×99772579² = 19909135040622482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99772571) 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, 363997 + ... + 364270.

It is an arithmetic number, because the mean of its divisors is an integer number (25125246).

Almost surely, 2^99772579 is an apocalyptic number.

99772579 is a deficient number, since it is larger than the sum of its proper divisors (728405).

99772579 is a wasteful number, since it uses less digits than its factorization.

99772579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728404.

The product of its digits is 2500470, while the sum is 55.

The square root of 99772579 is about 9988.6224775992. The cubic root of 99772579 is about 463.8067513608.

The spelling of 99772579 in words is "ninety-nine million, seven hundred seventy-two thousand, five hundred seventy-nine".