138510628 has 24 divisors (see below), whose sum is σ = 262917144. Its totient is φ = 63590400.

The previous prime is 138510599. The next prime is 138510629. The reversal of 138510628 is 826015831.

It can be written as a sum of positive squares in 4 ways, for example, as 21178404 + 117332224 = 4602^2 + 10832^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 138510593 and 138510602.

It is not an unprimeable number, because it can be changed into a prime (138510629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22053 + ... + 27628.

It is an arithmetic number, because the mean of its divisors is an integer number (10954881).

Almost surely, 2^138510628 is an apocalyptic number.

It is an amenable number.

138510628 is a deficient number, since it is larger than the sum of its proper divisors (124406516).

138510628 is a wasteful number, since it uses less digits than its factorization.

138510628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49743 (or 49741 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 138510628 is about 11769.0538277297. The cubic root of 138510628 is about 517.4015190634.

The spelling of 138510628 in words is "one hundred thirty-eight million, five hundred ten thousand, six hundred twenty-eight".