66972830 has 8 divisors (see below), whose sum is σ = 120551112. Its totient is φ = 26789128.

The previous prime is 66972817. The next prime is 66972859. The reversal of 66972830 is 3827966.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3348632 + ... + 3348651.

It is an arithmetic number, because the mean of its divisors is an integer number (15068889).

Almost surely, 2^66972830 is an apocalyptic number.

66972830 is a deficient number, since it is larger than the sum of its proper divisors (53578282).

66972830 is a wasteful number, since it uses less digits than its factorization.

66972830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6697290.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 66972830 is about 8183.6929316782. The cubic root of 66972830 is about 406.0999009988.

The spelling of 66972830 in words is "sixty-six million, nine hundred seventy-two thousand, eight hundred thirty".