90802640 has 40 divisors (see below), whose sum is σ = 212246088. Its totient is φ = 36126720.

The previous prime is 90802631. The next prime is 90802651. The reversal of 90802640 is 4620809.

It can be written as a sum of positive squares in 4 ways, for example, as 11806096 + 78996544 = 3436^2 + 8888^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12500 + ... + 18380.

Almost surely, 2^90802640 is an apocalyptic number.

It is an amenable number.

90802640 is an abundant number, since it is smaller than the sum of its proper divisors (121443448).

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

90802640 is a wasteful number, since it uses less digits than its factorization.

90802640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6087 (or 6081 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 90802640 is about 9529.0419245588. The cubic root of 90802640 is about 449.4687393066.

The spelling of 90802640 in words is "ninety million, eight hundred two thousand, six hundred forty".