66675744 has 48 divisors (see below), whose sum is σ = 194473440. Its totient is φ = 22224960.

The previous prime is 66675743. The next prime is 66675773. The reversal of 66675744 is 44757666.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 66675744.

It is not an unprimeable number, because it can be changed into a prime (66675743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37722 + ... + 39449.

It is an arithmetic number, because the mean of its divisors is an integer number (4051530).

Almost surely, 2^66675744 is an apocalyptic number.

It is an amenable number.

66675744 is an abundant number, since it is smaller than the sum of its proper divisors (127797696).

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

66675744 is a wasteful number, since it uses less digits than its factorization.

66675744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77190 (or 77176 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The square root of 66675744 is about 8165.5216612290. The cubic root of 66675744 is about 405.4985355947.

The spelling of 66675744 in words is "sixty-six million, six hundred seventy-five thousand, seven hundred forty-four".