861299712 has 396 divisors, whose sum is σ = 3116680320. Its totient is φ = 224280576.

The previous prime is 861299707. The next prime is 861299731. The reversal of 861299712 is 217992168.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10902489 + ... + 10902567.

Almost surely, 2^861299712 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 861299712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1558340160).

861299712 is an abundant number, since it is smaller than the sum of its proper divisors (2255380608).

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

861299712 is a wasteful number, since it uses less digits than its factorization.

861299712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 104 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 861299712 is about 29347.9081366969. The cubic root of 861299712 is about 951.4473642135.

The spelling of 861299712 in words is "eight hundred sixty-one million, two hundred ninety-nine thousand, seven hundred twelve".