66994928 has 160 divisors (see below), whose sum is σ = 179988480. Its totient is φ = 23316480.

The previous prime is 66994927. The next prime is 66994933. The reversal of 66994928 is 82949966.

It is a self number, because there is not a number n which added to its sum of digits gives 66994928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66994927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 752708 + ... + 752796.

It is an arithmetic number, because the mean of its divisors is an integer number (1124928).

Almost surely, 2^66994928 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 66994928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89994240).

66994928 is an abundant number, since it is smaller than the sum of its proper divisors (112993552).

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

66994928 is a wasteful number, since it uses less digits than its factorization.

66994928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 169 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 53.

The square root of 66994928 is about 8185.0429442978. The cubic root of 66994928 is about 406.1445609442.

The spelling of 66994928 in words is "sixty-six million, nine hundred ninety-four thousand, nine hundred twenty-eight".