66072138 has 16 divisors (see below), whose sum is σ = 144157536. Its totient is φ = 20021840.

The previous prime is 66072119. The next prime is 66072151. The reversal of 66072138 is 83127066.

66072138 is digitally balanced in base 2, 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 (33).

It is a junction number, because it is equal to n+sod(n) for n = 66072099 and 66072108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500481 + ... + 500612.

It is an arithmetic number, because the mean of its divisors is an integer number (9009846).

Almost surely, 2^66072138 is an apocalyptic number.

66072138 is an abundant number, since it is smaller than the sum of its proper divisors (78085398).

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

66072138 is a wasteful number, since it uses less digits than its factorization.

66072138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001109.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 66072138 is about 8128.4769791148. The cubic root of 66072138 is about 404.2711842966.

The spelling of 66072138 in words is "sixty-six million, seventy-two thousand, one hundred thirty-eight".