90990493 has 8 divisors (see below), whose sum is σ = 100459296. Its totient is φ = 81721200.

The previous prime is 90990479. The next prime is 90990503. The reversal of 90990493 is 39409909.

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-90990493 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 (90990413) 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, 48918 + ... + 50743.

It is an arithmetic number, because the mean of its divisors is an integer number (12557412).

Almost surely, 2^90990493 is an apocalyptic number.

It is an amenable number.

90990493 is a deficient number, since it is larger than the sum of its proper divisors (9468803).

90990493 is a wasteful number, since it uses less digits than its factorization.

90990493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99755.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 90990493 is about 9538.8936989569. The cubic root of 90990493 is about 449.7784802717.

The spelling of 90990493 in words is "ninety million, nine hundred ninety thousand, four hundred ninety-three".