90276721 has 4 divisors (see below), whose sum is σ = 90298944. Its totient is φ = 90254500.

The previous prime is 90276701. The next prime is 90276731. The reversal of 90276721 is 12767209.

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.

It is a cyclic number.

It is not a de Polignac number, because 90276721 - 2⁵ = 90276689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90276701) 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, 3085 + ... + 13786.

It is an arithmetic number, because the mean of its divisors is an integer number (22574736).

Almost surely, 2^90276721 is an apocalyptic number.

It is an amenable number.

90276721 is a deficient number, since it is larger than the sum of its proper divisors (22223).

90276721 is a wasteful number, since it uses less digits than its factorization.

90276721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22222.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 90276721 is about 9501.4062643379. The cubic root of 90276721 is about 448.5993005821.

The spelling of 90276721 in words is "ninety million, two hundred seventy-six thousand, seven hundred twenty-one".