90655440 has 80 divisors (see below), whose sum is σ = 286374528. Its totient is φ = 23715328.

The previous prime is 90655399. The next prime is 90655451. The reversal of 90655440 is 4455609.

It is a tau number, because it is divible by the number of its divisors (80).

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, 9157 + ... + 16283.

Almost surely, 2^90655440 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 90655440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143187264).

90655440 is an abundant number, since it is smaller than the sum of its proper divisors (195719088).

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

90655440 is a wasteful number, since it uses less digits than its factorization.

90655440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7196 (or 7190 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 90655440 is about 9521.3150352249. The cubic root of 90655440 is about 449.2257302845.

The spelling of 90655440 in words is "ninety million, six hundred fifty-five thousand, four hundred forty".