11731428 has 72 divisors (see below), whose sum is σ = 32530680. Its totient is φ = 3548160.

The previous prime is 11731409. The next prime is 11731451. The reversal of 11731428 is 82413711.

It can be written as a sum of positive squares in 4 ways, for example, as 4981824 + 6749604 = 2232^2 + 2598^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17418 + ... + 18078.

It is an arithmetic number, because the mean of its divisors is an integer number (451815).

Almost surely, 2^11731428 is an apocalyptic number.

11731428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11731428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16265340).

11731428 is an abundant number, since it is smaller than the sum of its proper divisors (20799252).

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

11731428 is a wasteful number, since it uses less digits than its factorization.

11731428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717 (or 712 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 11731428 is about 3425.1172242713. The cubic root of 11731428 is about 227.2219555338.

It can be divided in two parts, 1173 and 1428, that added together give a square (2601 = 51²).

The spelling of 11731428 in words is "eleven million, seven hundred thirty-one thousand, four hundred twenty-eight".