90840390 has 32 divisors (see below), whose sum is σ = 218439936. Its totient is φ = 24177120.

The previous prime is 90840377. The next prime is 90840419. The reversal of 90840390 is 9304809.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14479 + ... + 19781.

It is an arithmetic number, because the mean of its divisors is an integer number (6826248).

Almost surely, 2^90840390 is an apocalyptic number.

90840390 is an abundant number, since it is smaller than the sum of its proper divisors (127599546).

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

90840390 is a wasteful number, since it uses less digits than its factorization.

90840390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5884.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 90840390 is about 9531.0225054818. The cubic root of 90840390 is about 449.5310175770.

The spelling of 90840390 in words is "ninety million, eight hundred forty thousand, three hundred ninety".