90215263 has 4 divisors (see below), whose sum is σ = 90352408. Its totient is φ = 90078120.

The previous prime is 90215261. The next prime is 90215291. The reversal of 90215263 is 36251209.

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

It is a cyclic number.

It is not a de Polignac number, because 90215263 - 2¹ = 90215261 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 (90215261) 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, 67581 + ... + 68902.

It is an arithmetic number, because the mean of its divisors is an integer number (22588102).

Almost surely, 2^90215263 is an apocalyptic number.

90215263 is a deficient number, since it is larger than the sum of its proper divisors (137145).

90215263 is a wasteful number, since it uses less digits than its factorization.

90215263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137144.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 90215263 is about 9498.1715608848. The cubic root of 90215263 is about 448.4974792998.

The spelling of 90215263 in words is "ninety million, two hundred fifteen thousand, two hundred sixty-three".