861122784 has 48 divisors (see below), whose sum is σ = 2264289552. Its totient is φ = 286553088.

The previous prime is 861122761. The next prime is 861122789. The reversal of 861122784 is 487221168.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861122789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51532 + ... + 66164.

It is an arithmetic number, because the mean of its divisors is an integer number (47172699).

Almost surely, 2^861122784 is an apocalyptic number.

It is an amenable number.

861122784 is an abundant number, since it is smaller than the sum of its proper divisors (1403166768).

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

861122784 is a wasteful number, since it uses less digits than its factorization.

861122784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15259 (or 15251 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 861122784 is about 29344.8936614192. The cubic root of 861122784 is about 951.3822110483.

The spelling of 861122784 in words is "eight hundred sixty-one million, one hundred twenty-two thousand, seven hundred eighty-four".