90818641 has 8 divisors (see below), whose sum is σ = 97791840. Its totient is φ = 84026688.

The previous prime is 90818639. The next prime is 90818647. The reversal of 90818641 is 14681809.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 90818641 - 2¹ = 90818639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90818641.

It is not an unprimeable number, because it can be changed into a prime (90818647) 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, 44271 + ... + 46276.

It is an arithmetic number, because the mean of its divisors is an integer number (12223980).

Almost surely, 2^90818641 is an apocalyptic number.

It is an amenable number.

90818641 is a deficient number, since it is larger than the sum of its proper divisors (6973199).

90818641 is a wasteful number, since it uses less digits than its factorization.

90818641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90623.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 90818641 is about 9529.8814788013. The cubic root of 90818641 is about 449.4951391517.

The spelling of 90818641 in words is "ninety million, eight hundred eighteen thousand, six hundred forty-one".