87870457581 has 4 divisors (see below), whose sum is σ = 117160610112. Its totient is φ = 58580305052.

The previous prime is 87870457579. The next prime is 87870457603. The reversal of 87870457581 is 18575407878.

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 not a de Polignac number, because 87870457581 - 2¹ = 87870457579 is a prime.

It is a super-2 number, since 2×87870457581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87870457511) 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, 14645076261 + ... + 14645076266.

It is an arithmetic number, because the mean of its divisors is an integer number (29290152528).

Almost surely, 2^87870457581 is an apocalyptic number.

It is an amenable number.

87870457581 is a deficient number, since it is larger than the sum of its proper divisors (29290152531).

87870457581 is a wasteful number, since it uses less digits than its factorization.

87870457581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29290152530.

The product of its (nonzero) digits is 17561600, while the sum is 60.

The spelling of 87870457581 in words is "eighty-seven billion, eight hundred seventy million, four hundred fifty-seven thousand, five hundred eighty-one".