138725664 has 192 divisors, whose sum is σ = 464486400. Its totient is φ = 35938560.

The previous prime is 138725603. The next prime is 138725683. The reversal of 138725664 is 466527831.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 362017 + ... + 362399.

It is an arithmetic number, because the mean of its divisors is an integer number (2419200).

Almost surely, 2^138725664 is an apocalyptic number.

138725664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138725664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232243200).

138725664 is an abundant number, since it is smaller than the sum of its proper divisors (325760736).

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

138725664 is a wasteful number, since it uses less digits than its factorization.

138725664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428 (or 406 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The square root of 138725664 is about 11778.1859384202. The cubic root of 138725664 is about 517.6691337288.

The spelling of 138725664 in words is "one hundred thirty-eight million, seven hundred twenty-five thousand, six hundred sixty-four".