138528272 has 10 divisors (see below), whose sum is σ = 268398558. Its totient is φ = 69264128.

The previous prime is 138528251. The next prime is 138528277. The reversal of 138528272 is 272825831.

It can be written as a sum of positive squares in only one way, i.e., 136796416 + 1731856 = 11696^2 + 1316^2 .

It is not an unprimeable number, because it can be changed into a prime (138528277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4328993 + ... + 4329024.

Almost surely, 2^138528272 is an apocalyptic number.

It is an amenable number.

138528272 is a deficient number, since it is larger than the sum of its proper divisors (129870286).

138528272 is an equidigital number, since it uses as much as digits as its factorization.

138528272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8658025 (or 8658019 counting only the distinct ones).

The product of its digits is 53760, while the sum is 38.

The square root of 138528272 is about 11769.8033968287. The cubic root of 138528272 is about 517.4234876419.

The spelling of 138528272 in words is "one hundred thirty-eight million, five hundred twenty-eight thousand, two hundred seventy-two".