861412552 has 192 divisors, whose sum is σ = 2243082240. Its totient is φ = 307359360.

The previous prime is 861412529. The next prime is 861412597. The reversal of 861412552 is 255214168.

It is a happy number.

Its product of digits (19200) is a multiple of the sum of its prime divisors (160).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6782713 + ... + 6782839.

It is an arithmetic number, because the mean of its divisors is an integer number (11682720).

Almost surely, 2^861412552 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 861412552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1121541120).

861412552 is an abundant number, since it is smaller than the sum of its proper divisors (1381669688).

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

861412552 is a wasteful number, since it uses less digits than its factorization.

861412552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 160 counting only the distinct ones).

The product of its digits is 19200, while the sum is 34.

The square root of 861412552 is about 29349.8305276197. The cubic root of 861412552 is about 951.4889125196.

The spelling of 861412552 in words is "eight hundred sixty-one million, four hundred twelve thousand, five hundred fifty-two".