87559781 has 8 divisors (see below), whose sum is σ = 91554624. Its totient is φ = 83580640.

The previous prime is 87559757. The next prime is 87559789. The reversal of 87559781 is 18795578.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87559781 - 2¹⁴ = 87543397 is a prime.

It is a super-2 number, since 2×87559781² = 15333430497535922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87559789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8330 + ... + 15636.

It is an arithmetic number, because the mean of its divisors is an integer number (11444328).

Almost surely, 2^87559781 is an apocalyptic number.

It is an amenable number.

87559781 is a deficient number, since it is larger than the sum of its proper divisors (3994843).

87559781 is a wasteful number, since it uses less digits than its factorization.

87559781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7851.

The product of its digits is 705600, while the sum is 50.

The square root of 87559781 is about 9357.3383501934. The cubic root of 87559781 is about 444.0530822151.

The spelling of 87559781 in words is "eighty-seven million, five hundred fifty-nine thousand, seven hundred eighty-one".