90281687 has 2 divisors, whose sum is σ = 90281688. Its totient is φ = 90281686.

The previous prime is 90281677. The next prime is 90281699. The reversal of 90281687 is 78618209.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90281687 - 2⁸ = 90281431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90281617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45140843 + 45140844.

It is an arithmetic number, because the mean of its divisors is an integer number (45140844).

Almost surely, 2^90281687 is an apocalyptic number.

90281687 is a deficient number, since it is larger than the sum of its proper divisors (1).

90281687 is an equidigital number, since it uses as much as digits as its factorization.

90281687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 90281687 is about 9501.6675904812. The cubic root of 90281687 is about 448.6075260444.

The spelling of 90281687 in words is "ninety million, two hundred eighty-one thousand, six hundred eighty-seven".