90308729 has 16 divisors (see below), whose sum is σ = 111175680. Its totient is φ = 71623440.

The previous prime is 90308693. The next prime is 90308737. The reversal of 90308729 is 92780309.

It is not a de Polignac number, because 90308729 - 2⁸ = 90308473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90308692 and 90308701.

It is not an unprimeable number, because it can be changed into a prime (90308759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2177 + ... + 13614.

It is an arithmetic number, because the mean of its divisors is an integer number (6948480).

Almost surely, 2^90308729 is an apocalyptic number.

It is an amenable number.

90308729 is a deficient number, since it is larger than the sum of its proper divisors (20866951).

90308729 is a wasteful number, since it uses less digits than its factorization.

90308729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15860.

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

The square root of 90308729 is about 9503.0904973067. The cubic root of 90308729 is about 448.6523119218.

The spelling of 90308729 in words is "ninety million, three hundred eight thousand, seven hundred twenty-nine".