90921718 has 4 divisors (see below), whose sum is σ = 136382580. Its totient is φ = 45460858.

The previous prime is 90921703. The next prime is 90921749. The reversal of 90921718 is 81712909.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22730428 + ... + 22730431.

It is an arithmetic number, because the mean of its divisors is an integer number (34095645).

Almost surely, 2^90921718 is an apocalyptic number.

90921718 is a deficient number, since it is larger than the sum of its proper divisors (45460862).

90921718 is a wasteful number, since it uses less digits than its factorization.

90921718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45460861.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 90921718 is about 9535.2880396976. The cubic root of 90921718 is about 449.6651302907.

The spelling of 90921718 in words is "ninety million, nine hundred twenty-one thousand, seven hundred eighteen".