861582378 has 8 divisors (see below), whose sum is σ = 1723164768. Its totient is φ = 287194124.

The previous prime is 861582377. The next prime is 861582383. The reversal of 861582378 is 873285168.

861582378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

861582378 is an admirable number.

It is a super-3 number, since 3×861582378³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (861582377) 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, 71798526 + ... + 71798537.

It is an arithmetic number, because the mean of its divisors is an integer number (215395596).

Almost surely, 2^861582378 is an apocalyptic number.

861582378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

861582378 is a wasteful number, since it uses less digits than its factorization.

861582378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143597068.

The product of its digits is 645120, while the sum is 48.

The square root of 861582378 is about 29352.7235192920. The cubic root of 861582378 is about 951.5514365440.

The spelling of 861582378 in words is "eight hundred sixty-one million, five hundred eighty-two thousand, three hundred seventy-eight".