2724781 has 4 divisors (see below), whose sum is σ = 2788192. Its totient is φ = 2661372.

The previous prime is 2724779. The next prime is 2724803. The reversal of 2724781 is 1874272.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2724781 - 2¹ = 2724779 is a prime.

It is a super-2 number, since 2×2724781² = 14848862995922, which contains 22 as substring.

It is a Duffinian number.

2724781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2724721) 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, 31641 + ... + 31726.

It is an arithmetic number, because the mean of its divisors is an integer number (697048).

2^2724781 is an apocalyptic number.

It is an amenable number.

2724781 is a deficient number, since it is larger than the sum of its proper divisors (63411).

2724781 is an equidigital number, since it uses as much as digits as its factorization.

2724781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63410.

The product of its digits is 6272, while the sum is 31.

The square root of 2724781 is about 1650.6910674018. The cubic root of 2724781 is about 139.6723801798.

The spelling of 2724781 in words is "two million, seven hundred twenty-four thousand, seven hundred eighty-one".