872859440 has 20 divisors (see below), whose sum is σ = 2029398384. Its totient is φ = 349143744.

The previous prime is 872859439. The next prime is 872859461. The reversal of 872859440 is 44958278.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×872859440² = 1523767203994227200, which contains 22 as substring.

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, 5455292 + ... + 5455451.

Almost surely, 2^872859440 is an apocalyptic number.

872859440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

872859440 is an abundant number, since it is smaller than the sum of its proper divisors (1156538944).

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

872859440 is a wasteful number, since it uses less digits than its factorization.

872859440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10910756 (or 10910750 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 47.

The square root of 872859440 is about 29544.1946920203. The cubic root of 872859440 is about 955.6850032752.

The spelling of 872859440 in words is "eight hundred seventy-two million, eight hundred fifty-nine thousand, four hundred forty".