138028260 has 48 divisors (see below), whose sum is σ = 391934592. Its totient is φ = 36288000.

The previous prime is 138028259. The next prime is 138028273. The reversal of 138028260 is 62820831.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 15 ways as a sum of consecutive naturals, for example, 11941 + ... + 20460.

It is an arithmetic number, because the mean of its divisors is an integer number (8165304).

Almost surely, 2^138028260 is an apocalyptic number.

138028260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138028260 is an abundant number, since it is smaller than the sum of its proper divisors (253906332).

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

138028260 is a wasteful number, since it uses less digits than its factorization.

138028260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32484 (or 32482 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 138028260 is about 11748.5428883756. The cubic root of 138028260 is about 516.8001976519.

The spelling of 138028260 in words is "one hundred thirty-eight million, twenty-eight thousand, two hundred sixty".