861320756 has 12 divisors (see below), whose sum is σ = 1509113760. Its totient is φ = 430145400.

The previous prime is 861320753. The next prime is 861320791. The reversal of 861320756 is 657023168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861320753) 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, 124970 + ... + 131681.

It is an arithmetic number, because the mean of its divisors is an integer number (125759480).

Almost surely, 2^861320756 is an apocalyptic number.

It is an amenable number.

861320756 is a deficient number, since it is larger than the sum of its proper divisors (647793004).

861320756 is a wasteful number, since it uses less digits than its factorization.

861320756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257494 (or 257492 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 861320756 is about 29348.2666609120. The cubic root of 861320756 is about 951.4551130048.

The spelling of 861320756 in words is "eight hundred sixty-one million, three hundred twenty thousand, seven hundred fifty-six".