138663570 has 32 divisors (see below), whose sum is σ = 338437440. Its totient is φ = 36349760.

The previous prime is 138663563. The next prime is 138663571. The reversal of 138663570 is 75366831.

It is not an unprimeable number, because it can be changed into a prime (138663571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37401 + ... + 40940.

It is an arithmetic number, because the mean of its divisors is an integer number (10576170).

Almost surely, 2^138663570 is an apocalyptic number.

138663570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138663570 is an abundant number, since it is smaller than the sum of its proper divisors (199773870).

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

138663570 is a wasteful number, since it uses less digits than its factorization.

138663570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78410.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 138663570 is about 11775.5496686991. The cubic root of 138663570 is about 517.5918854788.

The spelling of 138663570 in words is "one hundred thirty-eight million, six hundred sixty-three thousand, five hundred seventy".