66694782 has 96 divisors (see below), whose sum is σ = 173746944. Its totient is φ = 16867200.

The previous prime is 66694781. The next prime is 66694799. The reversal of 66694782 is 28749666.

Its product of digits (870912) is a multiple of the sum of its prime divisors (567).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66694781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132343 + ... + 132845.

It is an arithmetic number, because the mean of its divisors is an integer number (1809864).

Almost surely, 2^66694782 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66694782, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86873472).

66694782 is an abundant number, since it is smaller than the sum of its proper divisors (107052162).

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

66694782 is a wasteful number, since it uses less digits than its factorization.

66694782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574 (or 567 counting only the distinct ones).

The product of its digits is 870912, while the sum is 48.

The square root of 66694782 is about 8166.6873333072. The cubic root of 66694782 is about 405.5371260726.

Subtracting from 66694782 its reverse (28749666), we obtain a triangular number (37945116 = T₈₇₁₁).

It can be divided in two parts, 66694 and 782, that added together give a palindrome (67476).

The spelling of 66694782 in words is "sixty-six million, six hundred ninety-four thousand, seven hundred eighty-two".