90886640 has 80 divisors (see below), whose sum is σ = 229110336. Its totient is φ = 33331200.

The previous prime is 90886619. The next prime is 90886687. The reversal of 90886640 is 4668809.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 292085 + ... + 292395.

Almost surely, 2^90886640 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 90886640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114555168).

90886640 is an abundant number, since it is smaller than the sum of its proper divisors (138223696).

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

90886640 is a wasteful number, since it uses less digits than its factorization.

90886640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 90886640 is about 9533.4484841530. The cubic root of 90886640 is about 449.6072952553.

The spelling of 90886640 in words is "ninety million, eight hundred eighty-six thousand, six hundred forty".