90666640 has 20 divisors (see below), whose sum is σ = 210800124. Its totient is φ = 36266624.

The previous prime is 90666629. The next prime is 90666683. The reversal of 90666640 is 4666609.

It can be written as a sum of positive squares in 2 ways, for example, as 68425984 + 22240656 = 8272^2 + 4716^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 90666640.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566587 + ... + 566746.

Almost surely, 2^90666640 is an apocalyptic number.

It is an amenable number.

90666640 is an abundant number, since it is smaller than the sum of its proper divisors (120133484).

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

90666640 is a wasteful number, since it uses less digits than its factorization.

90666640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133346 (or 1133340 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 90666640 is about 9521.9031711103. The cubic root of 90666640 is about 449.2442293435.

The spelling of 90666640 in words is "ninety million, six hundred sixty-six thousand, six hundred forty".