864854840 has 16 divisors (see below), whose sum is σ = 1945923480. Its totient is φ = 345941920.

The previous prime is 864854807. The next prime is 864854843. The reversal of 864854840 is 48458468.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864854843) 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, 10810646 + ... + 10810725.

Almost surely, 2^864854840 is an apocalyptic number.

It is an amenable number.

864854840 is an abundant number, since it is smaller than the sum of its proper divisors (1081068640).

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

864854840 is a wasteful number, since it uses less digits than its factorization.

864854840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21621382 (or 21621378 counting only the distinct ones).

The product of its (nonzero) digits is 983040, while the sum is 47.

The square root of 864854840 is about 29408.4144421286. The cubic root of 864854840 is about 952.7546419753.

The spelling of 864854840 in words is "eight hundred sixty-four million, eight hundred fifty-four thousand, eight hundred forty".