90735581 has 4 divisors (see below), whose sum is σ = 93187932. Its totient is φ = 88283232.

The previous prime is 90735563. The next prime is 90735587. The reversal of 90735581 is 18553709.

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

It can be written as a sum of positive squares in 2 ways, for example, as 53158681 + 37576900 = 7291^2 + 6130^2 .

It is a cyclic number.

It is not a de Polignac number, because 90735581 - 2¹⁴ = 90719197 is a prime.

It is a super-2 number, since 2×90735581² = 16465891318815122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90735587) 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, 1226120 + ... + 1226193.

It is an arithmetic number, because the mean of its divisors is an integer number (23296983).

Almost surely, 2^90735581 is an apocalyptic number.

It is an amenable number.

90735581 is a deficient number, since it is larger than the sum of its proper divisors (2452351).

90735581 is a wasteful number, since it uses less digits than its factorization.

90735581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2452350.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 90735581 is about 9525.5226103348. The cubic root of 90735581 is about 449.3580657731.

The spelling of 90735581 in words is "ninety million, seven hundred thirty-five thousand, five hundred eighty-one".