86891728 has 40 divisors (see below), whose sum is σ = 209897280. Its totient is φ = 33853440.

The previous prime is 86891711. The next prime is 86891737. The reversal of 86891728 is 82719868.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34033 + ... + 36496.

It is an arithmetic number, because the mean of its divisors is an integer number (5247432).

Almost surely, 2^86891728 is an apocalyptic number.

86891728 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

86891728 is an abundant number, since it is smaller than the sum of its proper divisors (123005552).

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

86891728 is a wasteful number, since it uses less digits than its factorization.

86891728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70555 (or 70549 counting only the distinct ones).

The product of its digits is 387072, while the sum is 49.

The square root of 86891728 is about 9321.5732577715. The cubic root of 86891728 is about 442.9208703891.

The spelling of 86891728 in words is "eighty-six million, eight hundred ninety-one thousand, seven hundred twenty-eight".