90328709 has 4 divisors (see below), whose sum is σ = 90451680. Its totient is φ = 90205740.

The previous prime is 90328703. The next prime is 90328747. The reversal of 90328709 is 90782309.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90328709 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 (90328703) 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, 60377 + ... + 61854.

It is an arithmetic number, because the mean of its divisors is an integer number (22612920).

Almost surely, 2^90328709 is an apocalyptic number.

It is an amenable number.

90328709 is a deficient number, since it is larger than the sum of its proper divisors (122971).

90328709 is a wasteful number, since it uses less digits than its factorization.

90328709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122970.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 90328709 is about 9504.1416761326. The cubic root of 90328709 is about 448.6853962548.

The spelling of 90328709 in words is "ninety million, three hundred twenty-eight thousand, seven hundred nine".