811378840 has 16 divisors (see below), whose sum is σ = 1825602480. Its totient is φ = 324551520.

The previous prime is 811378817. The next prime is 811378853. The reversal of 811378840 is 48873118.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 20284471 = 811378840 / (8 + 1 + 1 + 3 + 7 + 8 + 8 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 811378793 and 811378802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10142196 + ... + 10142275.

It is an arithmetic number, because the mean of its divisors is an integer number (114100155).

Almost surely, 2^811378840 is an apocalyptic number.

It is an amenable number.

811378840 is an abundant number, since it is smaller than the sum of its proper divisors (1014223640).

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

811378840 is a wasteful number, since it uses less digits than its factorization.

811378840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20284482 (or 20284478 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 811378840 is about 28484.7123910353. The cubic root of 811378840 is about 932.6983873056.

It can be divided in two parts, 811378 and 840, that added together give a palindrome (812218).

The spelling of 811378840 in words is "eight hundred eleven million, three hundred seventy-eight thousand, eight hundred forty".