66863020 has 24 divisors (see below), whose sum is σ = 160471584. Its totient is φ = 22924416.

The previous prime is 66863011. The next prime is 66863021. The reversal of 66863020 is 2036866.

It is not an unprimeable number, because it can be changed into a prime (66863021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238657 + ... + 238936.

It is an arithmetic number, because the mean of its divisors is an integer number (6686316).

Almost surely, 2^66863020 is an apocalyptic number.

It is an amenable number.

66863020 is an abundant number, since it is smaller than the sum of its proper divisors (93608564).

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

66863020 is a wasteful number, since it uses less digits than its factorization.

66863020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477609 (or 477607 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 66863020 is about 8176.9811055181. The cubic root of 66863020 is about 405.8778297267.

Adding to 66863020 its reverse (2036866), we get a palindrome (68899886).

The spelling of 66863020 in words is "sixty-six million, eight hundred sixty-three thousand, twenty".