90872779 has 4 divisors (see below), whose sum is σ = 91526680. Its totient is φ = 90218880.

The previous prime is 90872767. The next prime is 90872783. The reversal of 90872779 is 97727809.

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 90872779 - 2⁷ = 90872651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90822779) 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, 326742 + ... + 327019.

It is an arithmetic number, because the mean of its divisors is an integer number (22881670).

Almost surely, 2^90872779 is an apocalyptic number.

90872779 is a deficient number, since it is larger than the sum of its proper divisors (653901).

90872779 is a wasteful number, since it uses less digits than its factorization.

90872779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653900.

The product of its (nonzero) digits is 444528, while the sum is 49.

The square root of 90872779 is about 9532.7214896901. The cubic root of 90872779 is about 449.5844377574.

The spelling of 90872779 in words is "ninety million, eight hundred seventy-two thousand, seven hundred seventy-nine".