90309245 has 32 divisors (see below), whose sum is σ = 121228800. Its totient is φ = 64157184.

The previous prime is 90309221. The next prime is 90309281. The reversal of 90309245 is 54290309.

It is not a de Polignac number, because 90309245 - 2⁸ = 90308989 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220601 + ... + 221009.

It is an arithmetic number, because the mean of its divisors is an integer number (3788400).

Almost surely, 2^90309245 is an apocalyptic number.

It is an amenable number.

90309245 is a deficient number, since it is larger than the sum of its proper divisors (30919555).

90309245 is a wasteful number, since it uses less digits than its factorization.

90309245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 90309245 is about 9503.1176463306. The cubic root of 90309245 is about 448.6531664134.

The spelling of 90309245 in words is "ninety million, three hundred nine thousand, two hundred forty-five".