3157728 has 96 divisors (see below), whose sum is σ = 9805824. Its totient is φ = 870912.

The previous prime is 3157711. The next prime is 3157751. The reversal of 3157728 is 8277513.

It is a Cunningham number, because it is equal to 1777²-1.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×3157728² = 19942492243968, 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, 24801 + ... + 24927.

It is an arithmetic number, because the mean of its divisors is an integer number (102144).

Almost surely, 2^3157728 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 3157728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4902912).

3157728 is an abundant number, since it is smaller than the sum of its proper divisors (6648096).

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

3157728 is a wasteful number, since it uses less digits than its factorization.

3157728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 176 counting only the distinct ones).

The product of its digits is 11760, while the sum is 33.

The square root of 3157728 is about 1776.9997186269. Note that the first 3 decimals coincide. The cubic root of 3157728 is about 146.7095008040.

The spelling of 3157728 in words is "three million, one hundred fifty-seven thousand, seven hundred twenty-eight".