866815488 has 360 divisors, whose sum is σ = 3183780600. Its totient is φ = 224501760.

The previous prime is 866815487. The next prime is 866815507. The reversal of 866815488 is 884518668.

866815488 is a `hidden beast` number, since 86 + 6 + 81 + 5 + 488 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866815483) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2483538 + ... + 2483886.

It is an arithmetic number, because the mean of its divisors is an integer number (8843835).

Almost surely, 2^866815488 is an apocalyptic number.

866815488 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866815488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1591890300).

866815488 is an abundant number, since it is smaller than the sum of its proper divisors (2316965112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866815488 is a wasteful number, since it uses less digits than its factorization.

866815488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 372 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 54.

The square root of 866815488 is about 29441.7303839295. The cubic root of 866815488 is about 953.4740716254.

The spelling of 866815488 in words is "eight hundred sixty-six million, eight hundred fifteen thousand, four hundred eighty-eight".