66720142 has 8 divisors (see below), whose sum is σ = 100184976. Its totient is φ = 33325152.

The previous prime is 66720109. The next prime is 66720149. The reversal of 66720142 is 24102766.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66720142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66720149) 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, 15003 + ... + 18934.

It is an arithmetic number, because the mean of its divisors is an integer number (12523122).

Almost surely, 2^66720142 is an apocalyptic number.

66720142 is a deficient number, since it is larger than the sum of its proper divisors (33464834).

66720142 is a wasteful number, since it uses less digits than its factorization.

66720142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34922.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 66720142 is about 8168.2398348726. The cubic root of 66720142 is about 405.5885199896.

The spelling of 66720142 in words is "sixty-six million, seven hundred twenty thousand, one hundred forty-two".