90025021 has 8 divisors (see below), whose sum is σ = 95742080. Its totient is φ = 84405888.

The previous prime is 90024997. The next prime is 90025057. The reversal of 90025021 is 12052009.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90025021 - 2⁵ = 90024989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90025021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90025721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22581 + ... + 26266.

It is an arithmetic number, because the mean of its divisors is an integer number (11967760).

Almost surely, 2^90025021 is an apocalyptic number.

It is an amenable number.

90025021 is a deficient number, since it is larger than the sum of its proper divisors (5717059).

90025021 is a wasteful number, since it uses less digits than its factorization.

90025021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48963.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 90025021 is about 9488.1516113519. The cubic root of 90025021 is about 448.1820001515.

It can be divided in two parts, 900 and 25021, that added together give a square (25921 = 161²).

The spelling of 90025021 in words is "ninety million, twenty-five thousand, twenty-one".