865414128 has 80 divisors (see below), whose sum is σ = 2358222080. Its totient is φ = 272719872.

The previous prime is 865414103. The next prime is 865414141. The reversal of 865414128 is 821414568.

It is a super-2 number, since 2×865414128² = 1497883225884000768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 750000 + ... + 751152.

It is an arithmetic number, because the mean of its divisors is an integer number (29477776).

Almost surely, 2^865414128 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 865414128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1179111040).

865414128 is an abundant number, since it is smaller than the sum of its proper divisors (1492807952).

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

865414128 is a wasteful number, since it uses less digits than its factorization.

865414128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006 (or 2000 counting only the distinct ones).

The product of its digits is 61440, while the sum is 39.

The square root of 865414128 is about 29417.9218844568. The cubic root of 865414128 is about 952.9599748589.

The spelling of 865414128 in words is "eight hundred sixty-five million, four hundred fourteen thousand, one hundred twenty-eight".