90840920 has 32 divisors (see below), whose sum is σ = 209919600. Its totient is φ = 35353728.

The previous prime is 90840917. The next prime is 90840929. The reversal of 90840920 is 2904809.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90840929) 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, 29210 + ... + 32169.

Almost surely, 2^90840920 is an apocalyptic number.

It is an amenable number.

90840920 is an abundant number, since it is smaller than the sum of its proper divisors (119078680).

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

90840920 is a wasteful number, since it uses less digits than its factorization.

90840920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61427 (or 61423 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 90840920 is about 9531.0503093835. The cubic root of 90840920 is about 449.5318918246.

The spelling of 90840920 in words is "ninety million, eight hundred forty thousand, nine hundred twenty".