66790 has 8 divisors (see below), whose sum is σ = 120240. Its totient is φ = 26712.

The previous prime is 66763. The next prime is 66791. The reversal of 66790 is 9766.

66790 = 48² + 49² + ... + 67².

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3330 + ... + 3349.

It is an arithmetic number, because the mean of its divisors is an integer number (15030).

2⁶⁶⁷⁹⁰ is an apocalyptic number.

66790 is a deficient number, since it is larger than the sum of its proper divisors (53450).

66790 is a wasteful number, since it uses less digits than its factorization.

66790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6686.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 66790 is about 258.4376133615. The cubic root of 66790 is about 40.5730025083.

It can be divided in two parts, 667 and 90, that added together give a palindrome (757).

The spelling of 66790 in words is "sixty-six thousand, seven hundred ninety".