1307728 has 30 divisors (see below), whose sum is σ = 2658746. Its totient is φ = 622656.

The previous prime is 1307701. The next prime is 1307729. The reversal of 1307728 is 8277031.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1272384 + 35344 = 1128^2 + 188^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1307696 and 1307705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1307729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27801 + ... + 27847.

2^1307728 is an apocalyptic number.

It is an amenable number.

1307728 is an abundant number, since it is smaller than the sum of its proper divisors (1351018).

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

1307728 is an equidigital number, since it uses as much as digits as its factorization.

1307728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 1307728 is about 1143.5593556961. The cubic root of 1307728 is about 109.3551248784.

The spelling of 1307728 in words is "one million, three hundred seven thousand, seven hundred twenty-eight".