90721235 has 16 divisors (see below), whose sum is σ = 118990080. Its totient is φ = 65852640.

The previous prime is 90721229. The next prime is 90721243. The reversal of 90721235 is 53212709.

It is not a de Polignac number, because 90721235 - 2¹² = 90717139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90721198 and 90721207.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34994 + ... + 37496.

It is an arithmetic number, because the mean of its divisors is an integer number (7436880).

Almost surely, 2^90721235 is an apocalyptic number.

90721235 is a deficient number, since it is larger than the sum of its proper divisors (28268845).

90721235 is a wasteful number, since it uses less digits than its factorization.

90721235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3178.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 90721235 is about 9524.7695510180. The cubic root of 90721235 is about 449.3343821915.

The spelling of 90721235 in words is "ninety million, seven hundred twenty-one thousand, two hundred thirty-five".