66273536 has 72 divisors (see below), whose sum is σ = 156194304. Its totient is φ = 27463680.

The previous prime is 66273533. The next prime is 66273547. The reversal of 66273536 is 63537266.

It is a self number, because there is not a number n which added to its sum of digits gives 66273536.

It is not an unprimeable number, because it can be changed into a prime (66273533) 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, 54956 + ... + 56148.

Almost surely, 2^66273536 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 66273536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78097152).

66273536 is an abundant number, since it is smaller than the sum of its proper divisors (89920768).

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

66273536 is a wasteful number, since it uses less digits than its factorization.

66273536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247 (or 1233 counting only the distinct ones).

The product of its digits is 136080, while the sum is 38.

The square root of 66273536 is about 8140.8559746503. The cubic root of 66273536 is about 404.6815278189.

The spelling of 66273536 in words is "sixty-six million, two hundred seventy-three thousand, five hundred thirty-six".