727840 has 24 divisors (see below), whose sum is σ = 1719900. Its totient is φ = 291072.

The previous prime is 727823. The next prime is 727843. The reversal of 727840 is 48727.

It can be written as a sum of positive squares in 2 ways, for example, as 725904 + 1936 = 852^2 + 44^2 .

It is a plaindrome in base 6.

It is a junction number, because it is equal to n+sod(n) for n = 727799 and 727808.

It is not an unprimeable number, because it can be changed into a prime (727843) 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, 2115 + ... + 2434.

2⁷²⁷⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

727840 is an abundant number, since it is smaller than the sum of its proper divisors (992060).

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

727840 is a wasteful number, since it uses less digits than its factorization.

727840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4564 (or 4556 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 727840 is about 853.1353937096. The cubic root of 727840 is about 89.9522380322.

The spelling of 727840 in words is "seven hundred twenty-seven thousand, eight hundred forty".