66973704 has 128 divisors (see below), whose sum is σ = 200048640. Its totient is φ = 18289152.

The previous prime is 66973703. The next prime is 66973757. The reversal of 66973704 is 40737966.

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

It is not an unprimeable number, because it can be changed into a prime (66973703) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 527289 + ... + 527415.

It is an arithmetic number, because the mean of its divisors is an integer number (1562880).

Almost surely, 2^66973704 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 66973704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100024320).

66973704 is an abundant number, since it is smaller than the sum of its proper divisors (133074936).

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

66973704 is a wasteful number, since it uses less digits than its factorization.

66973704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 42.

The square root of 66973704 is about 8183.7463303795. The cubic root of 66973704 is about 406.1016675349.

It can be divided in two parts, 6697 and 3704, that added together give a palindrome (10401).

The spelling of 66973704 in words is "sixty-six million, nine hundred seventy-three thousand, seven hundred four".