66102784 has 80 divisors (see below), whose sum is σ = 146771856. Its totient is φ = 29736960.

The previous prime is 66102763. The next prime is 66102787. The reversal of 66102784 is 48720166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66102787) 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, 681424 + ... + 681520.

Almost surely, 2^66102784 is an apocalyptic number.

66102784 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66102784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73385928).

66102784 is an abundant number, since it is smaller than the sum of its proper divisors (80669072).

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

66102784 is an frugal number, since it uses more digits than its factorization.

66102784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 66102784 is about 8130.3618615656. The cubic root of 66102784 is about 404.3336785142. Note that the first 3 decimals are identical.

The spelling of 66102784 in words is "sixty-six million, one hundred two thousand, seven hundred eighty-four".