864527881 has 4 divisors (see below), whose sum is σ = 988031872. Its totient is φ = 741023892.

The previous prime is 864527863. The next prime is 864527893. The reversal of 864527881 is 188725468.

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 not a de Polignac number, because 864527881 - 2¹¹ = 864525833 is a prime.

It is a super-2 number, since 2×864527881² = 1494816914052700322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864527801) 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, 61751985 + ... + 61751998.

It is an arithmetic number, because the mean of its divisors is an integer number (247007968).

Almost surely, 2^864527881 is an apocalyptic number.

It is an amenable number.

864527881 is a deficient number, since it is larger than the sum of its proper divisors (123503991).

864527881 is a wasteful number, since it uses less digits than its factorization.

864527881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123503990.

The product of its digits is 860160, while the sum is 49.

The square root of 864527881 is about 29402.8549804266. The cubic root of 864527881 is about 952.6345636475.

The spelling of 864527881 in words is "eight hundred sixty-four million, five hundred twenty-seven thousand, eight hundred eighty-one".