90263681 has 4 divisors (see below), whose sum is σ = 90913200. Its totient is φ = 89614164.

The previous prime is 90263671. The next prime is 90263749. The reversal of 90263681 is 18636209.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18636209 = 2927 ⋅6367.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90263681 is a prime.

It is a super-2 number, since 2×90263681² = 16295064215339522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90263671) 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, 324551 + ... + 324828.

It is an arithmetic number, because the mean of its divisors is an integer number (22728300).

Almost surely, 2^90263681 is an apocalyptic number.

It is an amenable number.

90263681 is a deficient number, since it is larger than the sum of its proper divisors (649519).

90263681 is a wasteful number, since it uses less digits than its factorization.

90263681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649518.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 90263681 is about 9500.7200253454. The cubic root of 90263681 is about 448.5777002682.

The spelling of 90263681 in words is "ninety million, two hundred sixty-three thousand, six hundred eighty-one".