66104020 has 12 divisors (see below), whose sum is σ = 138818484. Its totient is φ = 26441600.

The previous prime is 66104011. The next prime is 66104033. The reversal of 66104020 is 2040166.

It can be written as a sum of positive squares in 2 ways, for example, as 6906384 + 59197636 = 2628^2 + 7694^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1652581 + ... + 1652620.

It is an arithmetic number, because the mean of its divisors is an integer number (11568207).

Almost surely, 2^66104020 is an apocalyptic number.

It is an amenable number.

66104020 is an abundant number, since it is smaller than the sum of its proper divisors (72714464).

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

66104020 is a wasteful number, since it uses less digits than its factorization.

66104020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3305210 (or 3305208 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 66104020 is about 8130.4378725872. The cubic root of 66104020 is about 404.3361985962.

Adding to 66104020 its reverse (2040166), we get a palindrome (68144186).

The spelling of 66104020 in words is "sixty-six million, one hundred four thousand, twenty".