2728381 has 8 divisors (see below), whose sum is σ = 3041280. Its totient is φ = 2432448.

The previous prime is 2728373. The next prime is 2728409. The reversal of 2728381 is 1838272.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2728381 - 2³ = 2728373 is a prime.

It is a super-2 number, since 2×2728381² = 14888125762322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2728301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3901 + ... + 4546.

It is an arithmetic number, because the mean of its divisors is an integer number (380160).

2^2728381 is an apocalyptic number.

It is an amenable number.

2728381 is a deficient number, since it is larger than the sum of its proper divisors (312899).

2728381 is a wasteful number, since it uses less digits than its factorization.

2728381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8483.

The product of its digits is 5376, while the sum is 31.

The square root of 2728381 is about 1651.7811598393. The cubic root of 2728381 is about 139.7338651563.

The spelling of 2728381 in words is "two million, seven hundred twenty-eight thousand, three hundred eighty-one".