90558640 has 40 divisors (see below), whose sum is σ = 211236480. Its totient is φ = 36105216.

The previous prime is 90558631. The next prime is 90558641. The reversal of 90558640 is 4685509.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 90558640.

It is not an unprimeable number, because it can be changed into a prime (90558641) 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, 25281 + ... + 28639.

It is an arithmetic number, because the mean of its divisors is an integer number (5280912).

Almost surely, 2^90558640 is an apocalyptic number.

It is an amenable number.

90558640 is an abundant number, since it is smaller than the sum of its proper divisors (120677840).

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

90558640 is a wasteful number, since it uses less digits than its factorization.

90558640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3709 (or 3703 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 90558640 is about 9516.2303460982. The cubic root of 90558640 is about 449.0657820330.

The spelling of 90558640 in words is "ninety million, five hundred fifty-eight thousand, six hundred forty".