90204749 has 4 divisors (see below), whose sum is σ = 90810300. Its totient is φ = 89599200.

The previous prime is 90204743. The next prime is 90204791. The reversal of 90204749 is 94740209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94740209 = 811 ⋅116819.

It can be written as a sum of positive squares in 2 ways, for example, as 27510025 + 62694724 = 5245^2 + 7918^2 .

It is a cyclic number.

It is not a de Polignac number, because 90204749 - 2¹⁶ = 90139213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90204743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302552 + ... + 302849.

It is an arithmetic number, because the mean of its divisors is an integer number (22702575).

Almost surely, 2^90204749 is an apocalyptic number.

It is an amenable number.

90204749 is a deficient number, since it is larger than the sum of its proper divisors (605551).

90204749 is a wasteful number, since it uses less digits than its factorization.

90204749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605550.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 90204749 is about 9497.6180698110. The cubic root of 90204749 is about 448.4800554717.

The spelling of 90204749 in words is "ninety million, two hundred four thousand, seven hundred forty-nine".