90749474 has 4 divisors (see below), whose sum is σ = 136124214. Its totient is φ = 45374736.

The previous prime is 90749471. The next prime is 90749521. The reversal of 90749474 is 47494709.

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., 82937449 + 7812025 = 9107^2 + 2795^2 .

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

It is not an unprimeable number, because it can be changed into a prime (90749471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22687367 + ... + 22687370.

Almost surely, 2^90749474 is an apocalyptic number.

90749474 is a deficient number, since it is larger than the sum of its proper divisors (45374740).

90749474 is a wasteful number, since it uses less digits than its factorization.

90749474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45374739.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 90749474 is about 9526.2518337487. The cubic root of 90749474 is about 449.3809991249.

The spelling of 90749474 in words is "ninety million, seven hundred forty-nine thousand, four hundred seventy-four".