1371428728 has 32 divisors (see below), whose sum is σ = 2687968800. Its totient is φ = 654742528.

The previous prime is 1371428711. The next prime is 1371428741. The reversal of 1371428728 is 8278241731.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102828 + ... + 115396.

It is an arithmetic number, because the mean of its divisors is an integer number (83999025).

Almost surely, 2^1371428728 is an apocalyptic number.

It is an amenable number.

1371428728 is a deficient number, since it is larger than the sum of its proper divisors (1316540072).

1371428728 is a wasteful number, since it uses less digits than its factorization.

1371428728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13191 (or 13187 counting only the distinct ones).

The product of its digits is 150528, while the sum is 43.

The square root of 1371428728 is about 37032.8061048579. The cubic root of 1371428728 is about 1111.0264908564.

The spelling of 1371428728 in words is "one billion, three hundred seventy-one million, four hundred twenty-eight thousand, seven hundred twenty-eight".