90471609 has 24 divisors (see below), whose sum is σ = 136328192. Its totient is φ = 57749760.

The previous prime is 90471607. The next prime is 90471617. The reversal of 90471609 is 90617409.

90471609 is a `hidden beast` number, since 9 + 0 + 47 + 1 + 609 = 666.

It is not a de Polignac number, because 90471609 - 2¹ = 90471607 is a prime.

It is a super-2 number, since 2×90471609² = 16370224070097762, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90471607) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25392 + ... + 28734.

Almost surely, 2^90471609 is an apocalyptic number.

It is an amenable number.

90471609 is a deficient number, since it is larger than the sum of its proper divisors (45856583).

90471609 is a wasteful number, since it uses less digits than its factorization.

90471609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3477 (or 3474 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 90471609 is about 9511.6564803403. The cubic root of 90471609 is about 448.9218783302.

The spelling of 90471609 in words is "ninety million, four hundred seventy-one thousand, six hundred nine".