2728387 has 4 divisors (see below), whose sum is σ = 2779920. Its totient is φ = 2676856.

The previous prime is 2728373. The next prime is 2728409. The reversal of 2728387 is 7838272.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2728387 - 2⁷ = 2728259 is a prime.

It is a Duffinian number.

2728387 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2728357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25687 + ... + 25792.

It is an arithmetic number, because the mean of its divisors is an integer number (694980).

2^2728387 is an apocalyptic number.

2728387 is a deficient number, since it is larger than the sum of its proper divisors (51533).

2728387 is an equidigital number, since it uses as much as digits as its factorization.

2728387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51532.

The product of its digits is 37632, while the sum is 37.

The square root of 2728387 is about 1651.7829760595. The cubic root of 2728387 is about 139.7339675861.

The spelling of 2728387 in words is "two million, seven hundred twenty-eight thousand, three hundred eighty-seven".