1376685728 has 36 divisors (see below), whose sum is σ = 2979153450. Its totient is φ = 625764480.

The previous prime is 1376685719. The next prime is 1376685773. The reversal of 1376685728 is 8275866731.

It can be written as a sum of positive squares in only one way, i.e., 1156816144 + 219869584 = 34012^2 + 14828^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1376685728.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 173903 + ... + 181646.

Almost surely, 2^1376685728 is an apocalyptic number.

It is an amenable number.

1376685728 is an abundant number, since it is smaller than the sum of its proper divisors (1602467722).

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

1376685728 is a wasteful number, since it uses less digits than its factorization.

1376685728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355581 (or 355562 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 53.

The square root of 1376685728 is about 37103.7158246987. The cubic root of 1376685728 is about 1112.4442870387. Note that the first 3 decimals are identical.

The spelling of 1376685728 in words is "one billion, three hundred seventy-six million, six hundred eighty-five thousand, seven hundred twenty-eight".