136890728 has 16 divisors (see below), whose sum is σ = 276414180. Its totient is φ = 63180288.

The previous prime is 136890727. The next prime is 136890731. The reversal of 136890728 is 827098631.

It can be written as a sum of positive squares in 2 ways, for example, as 136843204 + 47524 = 11698^2 + 218^2 .

It is not an unprimeable number, because it can be changed into a prime (136890727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 658025 + ... + 658232.

Almost surely, 2^136890728 is an apocalyptic number.

It is an amenable number.

136890728 is an abundant number, since it is smaller than the sum of its proper divisors (139523452).

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

136890728 is a wasteful number, since it uses less digits than its factorization.

136890728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316276 (or 1316272 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 136890728 is about 11700.0311110697. The cubic root of 136890728 is about 515.3765781863.

The spelling of 136890728 in words is "one hundred thirty-six million, eight hundred ninety thousand, seven hundred twenty-eight".