66733812 has 36 divisors (see below), whose sum is σ = 169181376. Its totient is φ = 22179600.

The previous prime is 66733811. The next prime is 66733813. The reversal of 66733812 is 21833766.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66733811) and next prime (66733813).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66733811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10687 + ... + 15737.

Almost surely, 2^66733812 is an apocalyptic number.

It is an amenable number.

66733812 is an abundant number, since it is smaller than the sum of its proper divisors (102447564).

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

66733812 is a wasteful number, since it uses less digits than its factorization.

66733812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5428 (or 5423 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 66733812 is about 8169.0765696008. The cubic root of 66733812 is about 405.6162178546.

The spelling of 66733812 in words is "sixty-six million, seven hundred thirty-three thousand, eight hundred twelve".