66026720 has 24 divisors (see below), whose sum is σ = 155988504. Its totient is φ = 26410624.

The previous prime is 66026689. The next prime is 66026731. The reversal of 66026720 is 2762066.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206174 + ... + 206493.

It is an arithmetic number, because the mean of its divisors is an integer number (6499521).

Almost surely, 2^66026720 is an apocalyptic number.

It is an amenable number.

66026720 is an abundant number, since it is smaller than the sum of its proper divisors (89961784).

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

66026720 is a wasteful number, since it uses less digits than its factorization.

66026720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412682 (or 412674 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 66026720 is about 8125.6827405456. The cubic root of 66026720 is about 404.1785310342.

Adding to 66026720 its reverse (2762066), we get a palindrome (68788786).

The spelling of 66026720 in words is "sixty-six million, twenty-six thousand, seven hundred twenty".