868629780 has 72 divisors (see below), whose sum is σ = 2640167712. Its totient is φ = 231166656.

The previous prime is 868629763. The next prime is 868629781. The reversal of 868629780 is 87926868.

868629780 is a `hidden beast` number, since 8 + 6 + 8 + 629 + 7 + 8 + 0 = 666.

868629780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868629781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89527 + ... + 98753.

It is an arithmetic number, because the mean of its divisors is an integer number (36668996).

Almost surely, 2^868629780 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 868629780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1320083856).

868629780 is an abundant number, since it is smaller than the sum of its proper divisors (1771537932).

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

868629780 is a wasteful number, since it uses less digits than its factorization.

868629780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9765 (or 9760 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The square root of 868629780 is about 29472.5258503577. The cubic root of 868629780 is about 954.1388324250.

The spelling of 868629780 in words is "eight hundred sixty-eight million, six hundred twenty-nine thousand, seven hundred eighty".