90821910 has 32 divisors (see below), whose sum is σ = 225491040. Its totient is φ = 23383808.

The previous prime is 90821903. The next prime is 90821911. The reversal of 90821910 is 1912809.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90821911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51327 + ... + 53066.

It is an arithmetic number, because the mean of its divisors is an integer number (7046595).

Almost surely, 2^90821910 is an apocalyptic number.

90821910 is an abundant number, since it is smaller than the sum of its proper divisors (134669130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90821910 is a wasteful number, since it uses less digits than its factorization.

90821910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104432.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 90821910 is about 9530.0529904088. The cubic root of 90821910 is about 449.5005322515.

The spelling of 90821910 in words is "ninety million, eight hundred twenty-one thousand, nine hundred ten".