811247864 has 48 divisors (see below), whose sum is σ = 1834743600. Its totient is φ = 329370624.

The previous prime is 811247851. The next prime is 811247873. The reversal of 811247864 is 468742118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152 + ... + 40280.

It is an arithmetic number, because the mean of its divisors is an integer number (38223825).

Almost surely, 2^811247864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 811247864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (917371800).

811247864 is an abundant number, since it is smaller than the sum of its proper divisors (1023495736).

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

811247864 is a wasteful number, since it uses less digits than its factorization.

811247864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40180 (or 40157 counting only the distinct ones).

The product of its digits is 86016, while the sum is 41.

The square root of 811247864 is about 28482.4132404542. The cubic root of 811247864 is about 932.6481979769.

It can be divided in two parts, 81124 and 7864, that added together give a palindrome (88988).

The spelling of 811247864 in words is "eight hundred eleven million, two hundred forty-seven thousand, eight hundred sixty-four".