861371764 has 24 divisors (see below), whose sum is σ = 1730988000. Its totient is φ = 370925280.

The previous prime is 861371713. The next prime is 861371779. The reversal of 861371764 is 467173168.

It is a super-2 number, since 2×861371764² = 1483922631632943392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 861371764.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514339 + ... + 516010.

It is an arithmetic number, because the mean of its divisors is an integer number (72124500).

Almost surely, 2^861371764 is an apocalyptic number.

It is an amenable number.

861371764 is an abundant number, since it is smaller than the sum of its proper divisors (869616236).

861371764 is a wasteful number, since it uses less digits than its factorization.

861371764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030383 (or 1030381 counting only the distinct ones).

The product of its digits is 169344, while the sum is 43.

The square root of 861371764 is about 29349.1356601860. The cubic root of 861371764 is about 951.4738945733.

The spelling of 861371764 in words is "eight hundred sixty-one million, three hundred seventy-one thousand, seven hundred sixty-four".