90728579 has 4 divisors (see below), whose sum is σ = 90765384. Its totient is φ = 90691776.

The previous prime is 90728563. The next prime is 90728593. The reversal of 90728579 is 97582709.

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 90728579 - 2⁴ = 90728563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90728179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14417 + ... + 19730.

It is an arithmetic number, because the mean of its divisors is an integer number (22691346).

Almost surely, 2^90728579 is an apocalyptic number.

90728579 is a deficient number, since it is larger than the sum of its proper divisors (36805).

90728579 is a wasteful number, since it uses less digits than its factorization.

90728579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36804.

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 90728579 is about 9525.1550643546. The cubic root of 90728579 is about 449.3465065954.

The spelling of 90728579 in words is "ninety million, seven hundred twenty-eight thousand, five hundred seventy-nine".