90615394 has 4 divisors (see below), whose sum is σ = 135923094. Its totient is φ = 45307696.

The previous prime is 90615391. The next prime is 90615403. The reversal of 90615394 is 49351609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49351609 = 1109 ⋅44501.

It can be written as a sum of positive squares in only one way, i.e., 84879369 + 5736025 = 9213^2 + 2395^2 .

It is a super-2 number, since 2×90615394² = 16422299259550472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90615391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22653847 + ... + 22653850.

Almost surely, 2^90615394 is an apocalyptic number.

90615394 is a deficient number, since it is larger than the sum of its proper divisors (45307700).

90615394 is a wasteful number, since it uses less digits than its factorization.

90615394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45307699.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 90615394 is about 9519.2118371218. The cubic root of 90615394 is about 449.1595737723.

The spelling of 90615394 in words is "ninety million, six hundred fifteen thousand, three hundred ninety-four".