90705187 has 4 divisors (see below), whose sum is σ = 90729616. Its totient is φ = 90680760.

The previous prime is 90705089. The next prime is 90705191. The reversal of 90705187 is 78150709.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90705187 - 2¹⁵ = 90672419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90205187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5364 + ... + 14497.

It is an arithmetic number, because the mean of its divisors is an integer number (22682404).

Almost surely, 2^90705187 is an apocalyptic number.

90705187 is a deficient number, since it is larger than the sum of its proper divisors (24429).

90705187 is a wasteful number, since it uses less digits than its factorization.

90705187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24428.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 90705187 is about 9523.9270786793. The cubic root of 90705187 is about 449.3078858466.

The spelling of 90705187 in words is "ninety million, seven hundred five thousand, one hundred eighty-seven".