90111687 has 16 divisors (see below), whose sum is σ = 123694560. Its totient is φ = 58352256.

The previous prime is 90111683. The next prime is 90111691. The reversal of 90111687 is 78611109.

It is an interprime number because it is at equal distance from previous prime (90111683) and next prime (90111691).

It is not a de Polignac number, because 90111687 - 2² = 90111683 is a prime.

It is a super-2 number, since 2×90111687² = 16240232267971938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90111683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151663 + ... + 152255.

It is an arithmetic number, because the mean of its divisors is an integer number (7730910).

Almost surely, 2^90111687 is an apocalyptic number.

90111687 is a deficient number, since it is larger than the sum of its proper divisors (33582873).

90111687 is an frugal number, since it uses more digits than its factorization.

90111687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707 (or 633 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 33.

The square root of 90111687 is about 9492.7175771746. The cubic root of 90111687 is about 448.3257738238.

The spelling of 90111687 in words is "ninety million, one hundred eleven thousand, six hundred eighty-seven".