66672782 has 8 divisors (see below), whose sum is σ = 109100952. Its totient is φ = 30305800.

The previous prime is 66672737. The next prime is 66672787. The reversal of 66672782 is 28727666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66672787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515269 + ... + 1515312.

It is an arithmetic number, because the mean of its divisors is an integer number (13637619).

Almost surely, 2^66672782 is an apocalyptic number.

66672782 is a deficient number, since it is larger than the sum of its proper divisors (42428170).

66672782 is a wasteful number, since it uses less digits than its factorization.

66672782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030594.

The product of its digits is 338688, while the sum is 44.

The square root of 66672782 is about 8165.3402868466. The cubic root of 66672782 is about 405.4925308900.

Subtracting from 66672782 its reverse (28727666), we obtain a triangular number (37945116 = T₈₇₁₁).

It can be divided in two parts, 6667 and 2782, that added together give a palindrome (9449).

The spelling of 66672782 in words is "sixty-six million, six hundred seventy-two thousand, seven hundred eighty-two".