90237820 has 48 divisors (see below), whose sum is σ = 195924960. Its totient is φ = 34884864.

The previous prime is 90237817. The next prime is 90237841. The reversal of 90237820 is 2873209.

It is a congruent number.

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, 145471 + ... + 146089.

It is an arithmetic number, because the mean of its divisors is an integer number (4081770).

Almost surely, 2^90237820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90237820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97962480).

90237820 is an abundant number, since it is smaller than the sum of its proper divisors (105687140).

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

90237820 is a wasteful number, since it uses less digits than its factorization.

90237820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 90237820 is about 9499.3589257381. The cubic root of 90237820 is about 448.5348562515.

The spelling of 90237820 in words is "ninety million, two hundred thirty-seven thousand, eight hundred twenty".