1381712728 has 32 divisors (see below), whose sum is σ = 2828468160. Its totient is φ = 627554080.

The previous prime is 1381712713. The next prime is 1381712729. The reversal of 1381712728 is 8272171831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381712729) 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, 120075 + ... + 131077.

It is an arithmetic number, because the mean of its divisors is an integer number (88389630).

Almost surely, 2^1381712728 is an apocalyptic number.

It is an amenable number.

1381712728 is an abundant number, since it is smaller than the sum of its proper divisors (1446755432).

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

1381712728 is a wasteful number, since it uses less digits than its factorization.

1381712728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12447 (or 12443 counting only the distinct ones).

The product of its digits is 37632, while the sum is 40.

The square root of 1381712728 is about 37171.3966377375. The cubic root of 1381712728 is about 1113.7966810140.

The spelling of 1381712728 in words is "one billion, three hundred eighty-one million, seven hundred twelve thousand, seven hundred twenty-eight".