2491728 has 80 divisors (see below), whose sum is σ = 7011456. Its totient is φ = 760320.

The previous prime is 2491711. The next prime is 2491729. The reversal of 2491728 is 8271942.

It is a happy number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

Its product of digits (8064) is a multiple of the sum of its prime divisors (126).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40818 + ... + 40878.

2^2491728 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 2491728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3505728).

2491728 is an abundant number, since it is smaller than the sum of its proper divisors (4519728).

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

2491728 is a wasteful number, since it uses less digits than its factorization.

2491728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 126 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 2491728 is about 1578.5208265968. The cubic root of 2491728 is about 135.5710243428.

The spelling of 2491728 in words is "two million, four hundred ninety-one thousand, seven hundred twenty-eight".