87561427 has 4 divisors (see below), whose sum is σ = 88141456. Its totient is φ = 86981400.

The previous prime is 87561403. The next prime is 87561449. The reversal of 87561427 is 72416578.

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 87561427 - 2¹¹ = 87559379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87561427.

It is not an unprimeable number, because it can be changed into a prime (87561457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289788 + ... + 290089.

It is an arithmetic number, because the mean of its divisors is an integer number (22035364).

Almost surely, 2^87561427 is an apocalyptic number.

87561427 is a deficient number, since it is larger than the sum of its proper divisors (580029).

87561427 is a wasteful number, since it uses less digits than its factorization.

87561427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580028.

The product of its digits is 94080, while the sum is 40.

The square root of 87561427 is about 9357.4263021410. The cubic root of 87561427 is about 444.0558647209.

The spelling of 87561427 in words is "eighty-seven million, five hundred sixty-one thousand, four hundred twenty-seven".