870921672 has 32 divisors (see below), whose sum is σ = 2230411680. Its totient is φ = 283226240.

The previous prime is 870921671. The next prime is 870921673. The reversal of 870921672 is 276129078.

It is an interprime number because it is at equal distance from previous prime (870921671) and next prime (870921673).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (870921671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 441558 + ... + 443525.

It is an arithmetic number, because the mean of its divisors is an integer number (69700365).

Almost surely, 2^870921672 is an apocalyptic number.

870921672 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

870921672 is an abundant number, since it is smaller than the sum of its proper divisors (1359490008).

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

870921672 is a wasteful number, since it uses less digits than its factorization.

870921672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885133 (or 885129 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 870921672 is about 29511.3820753959. The cubic root of 870921672 is about 954.9772650674.

It can be divided in two parts, 8709 and 21672, that added together give a triangular number (30381 = T₂₄₆).

The spelling of 870921672 in words is "eight hundred seventy million, nine hundred twenty-one thousand, six hundred seventy-two".