870821652 has 12 divisors (see below), whose sum is σ = 2031917216. Its totient is φ = 290273880.

The previous prime is 870821647. The next prime is 870821663. The reversal of 870821652 is 256128078.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 870821652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36284224 + ... + 36284247.

Almost surely, 2^870821652 is an apocalyptic number.

It is an amenable number.

870821652 is an abundant number, since it is smaller than the sum of its proper divisors (1161095564).

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

870821652 is a wasteful number, since it uses less digits than its factorization.

870821652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72568478 (or 72568476 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 870821652 is about 29509.6874263351. The cubic root of 870821652 is about 954.9407059117.

The spelling of 870821652 in words is "eight hundred seventy million, eight hundred twenty-one thousand, six hundred fifty-two".