90987867 has 10 divisors (see below), whose sum is σ = 135920268. Its totient is φ = 60658524.

The previous prime is 90987851. The next prime is 90987881. The reversal of 90987867 is 76878909.

It is not a de Polignac number, because 90987867 - 2⁴ = 90987851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90987467) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 561573 + ... + 561734.

Almost surely, 2^90987867 is an apocalyptic number.

90987867 is a deficient number, since it is larger than the sum of its proper divisors (44932401).

90987867 is a wasteful number, since it uses less digits than its factorization.

90987867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123319 (or 1123310 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 90987867 is about 9538.7560509744. The cubic root of 90987867 is about 449.7741533374.

The spelling of 90987867 in words is "ninety million, nine hundred eighty-seven thousand, eight hundred sixty-seven".