136868728 has 8 divisors (see below), whose sum is σ = 256628880. Its totient is φ = 68434360.

The previous prime is 136868707. The next prime is 136868741. The reversal of 136868728 is 827868631.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8554288 + ... + 8554303.

It is an arithmetic number, because the mean of its divisors is an integer number (32078610).

Almost surely, 2^136868728 is an apocalyptic number.

It is an amenable number.

136868728 is a deficient number, since it is larger than the sum of its proper divisors (119760152).

136868728 is a wasteful number, since it uses less digits than its factorization.

136868728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17108597 (or 17108593 counting only the distinct ones).

The product of its digits is 774144, while the sum is 49.

The square root of 136868728 is about 11699.0909048524. The cubic root of 136868728 is about 515.3489676185.

The spelling of 136868728 in words is "one hundred thirty-six million, eight hundred sixty-eight thousand, seven hundred twenty-eight".