90147989 has 8 divisors (see below), whose sum is σ = 95393280. Its totient is φ = 84952800.

The previous prime is 90147983. The next prime is 90148001. The reversal of 90147989 is 98974109.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-90147989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90147983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8792 + ... + 16049.

It is an arithmetic number, because the mean of its divisors is an integer number (11924160).

Almost surely, 2^90147989 is an apocalyptic number.

It is an amenable number.

90147989 is a deficient number, since it is larger than the sum of its proper divisors (5245291).

90147989 is a wasteful number, since it uses less digits than its factorization.

90147989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25051.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 90147989 is about 9494.6294819756. The cubic root of 90147989 is about 448.3859692612.

The spelling of 90147989 in words is "ninety million, one hundred forty-seven thousand, nine hundred eighty-nine".