90709474 has 4 divisors (see below), whose sum is σ = 136064214. Its totient is φ = 45354736.

The previous prime is 90709469. The next prime is 90709499. The reversal of 90709474 is 47490709.

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., 78057225 + 12652249 = 8835^2 + 3557^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22677367 + ... + 22677370.

Almost surely, 2^90709474 is an apocalyptic number.

90709474 is a deficient number, since it is larger than the sum of its proper divisors (45354740).

90709474 is a wasteful number, since it uses less digits than its factorization.

90709474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45354739.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 90709474 is about 9524.1521407420. The cubic root of 90709474 is about 449.3149642826.

The spelling of 90709474 in words is "ninety million, seven hundred nine thousand, four hundred seventy-four".