90749818 has 4 divisors (see below), whose sum is σ = 136124730. Its totient is φ = 45374908.

The previous prime is 90749797. The next prime is 90749821. The reversal of 90749818 is 81894709.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 69006249 + 21743569 = 8307^2 + 4663^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22687453 + ... + 22687456.

Almost surely, 2^90749818 is an apocalyptic number.

90749818 is a deficient number, since it is larger than the sum of its proper divisors (45374912).

90749818 is a wasteful number, since it uses less digits than its factorization.

90749818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45374911.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 90749818 is about 9526.2698891014. The cubic root of 90749818 is about 449.3815669404.

The spelling of 90749818 in words is "ninety million, seven hundred forty-nine thousand, eight hundred eighteen".