66738492 has 54 divisors (see below), whose sum is σ = 175248528. Its totient is φ = 22237416.

The previous prime is 66738473. The next prime is 66738493. The reversal of 66738492 is 29483766.

It is a tau number, because it is divible by the number of its divisors (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66738493) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 24973 + ... + 27515.

Almost surely, 2^66738492 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 66738492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87624264).

66738492 is an abundant number, since it is smaller than the sum of its proper divisors (108510036).

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

66738492 is an equidigital number, since it uses as much as digits as its factorization.

66738492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571 (or 2548 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 66738492 is about 8169.3630106637. The cubic root of 66738492 is about 405.6256995025.

The spelling of 66738492 in words is "sixty-six million, seven hundred thirty-eight thousand, four hundred ninety-two".