7851864 has 64 divisors (see below), whose sum is σ = 21052800. Its totient is φ = 2433024.

The previous prime is 7851863. The next prime is 7851871. The reversal of 7851864 is 4681587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7851863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30424 + ... + 30680.

It is an arithmetic number, because the mean of its divisors is an integer number (328950).

Almost surely, 2^7851864 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 7851864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10526400).

7851864 is an abundant number, since it is smaller than the sum of its proper divisors (13200936).

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

7851864 is a wasteful number, since it uses less digits than its factorization.

7851864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352 (or 348 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 7851864 is about 2802.1177705443. The cubic root of 7851864 is about 198.7578344287.

The spelling of 7851864 in words is "seven million, eight hundred fifty-one thousand, eight hundred sixty-four".