66020000 has 60 divisors (see below), whose sum is σ = 162468306. Its totient is φ = 26400000.

The previous prime is 66019973. The next prime is 66020011. The reversal of 66020000 is 2066.

It can be written as a sum of positive squares in 5 ways, for example, as 150544 + 65869456 = 388^2 + 8116^2 .

It is a hoax number, since the sum of its digits (14) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 18350 + ... + 21650.

Almost surely, 2^66020000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81234153).

66020000 is an abundant number, since it is smaller than the sum of its proper divisors (96448306).

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

66020000 is an equidigital number, since it uses as much as digits as its factorization.

66020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3331 (or 3308 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 66020000 is about 8125.2692263088. The cubic root of 66020000 is about 404.1648185459.

Adding to 66020000 its reverse (2066), we get a palindrome (66022066).

The spelling of 66020000 in words is "sixty-six million, twenty thousand".