90802921 has 8 divisors (see below), whose sum is σ = 101735424. Its totient is φ = 80316720.

The previous prime is 90802909. The next prime is 90802927. The reversal of 90802921 is 12920809.

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

It is not a de Polignac number, because 90802921 - 2¹⁵ = 90770153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90802927) 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, 111145 + ... + 111958.

It is an arithmetic number, because the mean of its divisors is an integer number (12716928).

Almost surely, 2^90802921 is an apocalyptic number.

It is an amenable number.

90802921 is a deficient number, since it is larger than the sum of its proper divisors (10932503).

90802921 is a wasteful number, since it uses less digits than its factorization.

90802921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223151.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 90802921 is about 9529.0566689468. The cubic root of 90802921 is about 449.4692029516.

The spelling of 90802921 in words is "ninety million, eight hundred two thousand, nine hundred twenty-one".