66829812 has 48 divisors (see below), whose sum is σ = 185966592. Its totient is φ = 18263520.

The previous prime is 66829793. The next prime is 66829823. The reversal of 66829812 is 21892866.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15364 + ... + 19227.

It is an arithmetic number, because the mean of its divisors is an integer number (3874304).

Almost surely, 2^66829812 is an apocalyptic number.

It is an amenable number.

66829812 is an abundant number, since it is smaller than the sum of its proper divisors (119136780).

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

66829812 is a wasteful number, since it uses less digits than its factorization.

66829812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34628 (or 34626 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 66829812 is about 8174.9502750781. The cubic root of 66829812 is about 405.8106245512.

The spelling of 66829812 in words is "sixty-six million, eight hundred twenty-nine thousand, eight hundred twelve".