138622464 has 120 divisors (see below), whose sum is σ = 406949400. Its totient is φ = 45416448.

The previous prime is 138622457. The next prime is 138622487. The reversal of 138622464 is 464226831.

138622464 is a `hidden beast` number, since 138 + 62 + 2 + 464 = 666.

138622464 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308512 + ... + 308960.

It is an arithmetic number, because the mean of its divisors is an integer number (3391245).

Almost surely, 2^138622464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138622464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203474700).

138622464 is an abundant number, since it is smaller than the sum of its proper divisors (268326936).

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

138622464 is an equidigital number, since it uses as much as digits as its factorization.

138622464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540 (or 521 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 138622464 is about 11773.8041430967. The cubic root of 138622464 is about 517.5407347337.

The spelling of 138622464 in words is "one hundred thirty-eight million, six hundred twenty-two thousand, four hundred sixty-four".