87442561 has 4 divisors (see below), whose sum is σ = 87476400. Its totient is φ = 87408724.

The previous prime is 87442549. The next prime is 87442583. The reversal of 87442561 is 16524478.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87442561 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 87442561.

It is not an unprimeable number, because it can be changed into a prime (87442261) 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, 12691 + ... + 18328.

It is an arithmetic number, because the mean of its divisors is an integer number (21869100).

Almost surely, 2^87442561 is an apocalyptic number.

It is an amenable number.

87442561 is a deficient number, since it is larger than the sum of its proper divisors (33839).

87442561 is a wasteful number, since it uses less digits than its factorization.

87442561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33838.

The product of its digits is 53760, while the sum is 37.

The square root of 87442561 is about 9351.0727192125. The cubic root of 87442561 is about 443.8548361443.

The spelling of 87442561 in words is "eighty-seven million, four hundred forty-two thousand, five hundred sixty-one".