869442660 has 240 divisors, whose sum is σ = 2936989440. Its totient is φ = 214617600.

The previous prime is 869442631. The next prime is 869442661. The reversal of 869442660 is 66244968.

869442660 is a `hidden beast` number, since 86 + 94 + 426 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (869442661) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1446360 + ... + 1446960.

It is an arithmetic number, because the mean of its divisors is an integer number (12237456).

Almost surely, 2^869442660 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 869442660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1468494720).

869442660 is an abundant number, since it is smaller than the sum of its proper divisors (2067546780).

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

869442660 is a wasteful number, since it uses less digits than its factorization.

869442660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688 (or 677 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 869442660 is about 29486.3130960790. The cubic root of 869442660 is about 954.4363732865.

The spelling of 869442660 in words is "eight hundred sixty-nine million, four hundred forty-two thousand, six hundred sixty".