87840561 has 8 divisors (see below), whose sum is σ = 118770624. Its totient is φ = 57735440.

The previous prime is 87840541. The next prime is 87840569. The reversal of 87840561 is 16504878.

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 87840561 - 2¹⁵ = 87807793 is a prime.

It is a super-3 number, since 3×87840561³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (87840569) 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, 205986 + ... + 206411.

It is an arithmetic number, because the mean of its divisors is an integer number (14846328).

Almost surely, 2^87840561 is an apocalyptic number.

It is an amenable number.

87840561 is a deficient number, since it is larger than the sum of its proper divisors (30930063).

87840561 is a wasteful number, since it uses less digits than its factorization.

87840561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412471.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 87840561 is about 9372.3295396609. The cubic root of 87840561 is about 444.5272275635.

The spelling of 87840561 in words is "eighty-seven million, eight hundred forty thousand, five hundred sixty-one".