870661812 has 12 divisors (see below), whose sum is σ = 2031544256. Its totient is φ = 290220600.

The previous prime is 870661811. The next prime is 870661819. The reversal of 870661812 is 218166078.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870661811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36277564 + ... + 36277587.

Almost surely, 2^870661812 is an apocalyptic number.

It is an amenable number.

870661812 is an abundant number, since it is smaller than the sum of its proper divisors (1160882444).

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

870661812 is a wasteful number, since it uses less digits than its factorization.

870661812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72555158 (or 72555156 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 870661812 is about 29506.9790388647. The cubic root of 870661812 is about 954.8822756304.

The spelling of 870661812 in words is "eight hundred seventy million, six hundred sixty-one thousand, eight hundred twelve".