136243280 has 20 divisors (see below), whose sum is σ = 316765812. Its totient is φ = 54497280.

The previous prime is 136243279. The next prime is 136243291. The reversal of 136243280 is 82342631.

It can be written as a sum of positive squares in 2 ways, for example, as 108659776 + 27583504 = 10424^2 + 5252^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851441 + ... + 851600.

Almost surely, 2^136243280 is an apocalyptic number.

136243280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136243280 is an abundant number, since it is smaller than the sum of its proper divisors (180522532).

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

136243280 is a wasteful number, since it uses less digits than its factorization.

136243280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703054 (or 1703048 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 136243280 is about 11672.3296732058. The cubic root of 136243280 is about 514.5627734068.

The spelling of 136243280 in words is "one hundred thirty-six million, two hundred forty-three thousand, two hundred eighty".