90561887 has 16 divisors (see below), whose sum is σ = 99792000. Its totient is φ = 81679104.

The previous prime is 90561871. The next prime is 90561893. The reversal of 90561887 is 78816509.

It is a happy number.

It is not a de Polignac number, because 90561887 - 2⁴ = 90561871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90561817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111539 + ... + 112347.

It is an arithmetic number, because the mean of its divisors is an integer number (6237000).

Almost surely, 2^90561887 is an apocalyptic number.

90561887 is a deficient number, since it is larger than the sum of its proper divisors (9230113).

90561887 is a wasteful number, since it uses less digits than its factorization.

90561887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 90561887 is about 9516.4009478374. The cubic root of 90561887 is about 449.0711490863.

The spelling of 90561887 in words is "ninety million, five hundred sixty-one thousand, eight hundred eighty-seven".