90321687 has 12 divisors (see below), whose sum is σ = 137331480. Its totient is φ = 57045168.

The previous prime is 90321683. The next prime is 90321703. The reversal of 90321687 is 78612309.

It is not a de Polignac number, because 90321687 - 2² = 90321683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90321683) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 263928 + ... + 264269.

It is an arithmetic number, because the mean of its divisors is an integer number (11444290).

Almost surely, 2^90321687 is an apocalyptic number.

90321687 is a deficient number, since it is larger than the sum of its proper divisors (47009793).

90321687 is a wasteful number, since it uses less digits than its factorization.

90321687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528222 (or 528219 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 90321687 is about 9503.7722510590. The cubic root of 90321687 is about 448.6737692740.

The spelling of 90321687 in words is "ninety million, three hundred twenty-one thousand, six hundred eighty-seven".