861214464 has 288 divisors, whose sum is σ = 2849172480. Its totient is φ = 254361600.

The previous prime is 861214411. The next prime is 861214477. The reversal of 861214464 is 464412168.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3573384 + ... + 3573624.

It is an arithmetic number, because the mean of its divisors is an integer number (9892960).

Almost surely, 2^861214464 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 861214464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1424586240).

861214464 is an abundant number, since it is smaller than the sum of its proper divisors (1987958016).

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

861214464 is a wasteful number, since it uses less digits than its factorization.

861214464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 304 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 861214464 is about 29346.4557314848. The cubic root of 861214464 is about 951.4159730264.

The spelling of 861214464 in words is "eight hundred sixty-one million, two hundred fourteen thousand, four hundred sixty-four".