66999296 has 88 divisors (see below), whose sum is σ = 165070080. Its totient is φ = 26468352.

The previous prime is 66999293. The next prime is 66999313. The reversal of 66999296 is 69299966.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a nialpdrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66999293) 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, 92825 + ... + 93543.

Almost surely, 2^66999296 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 66999296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82535040).

66999296 is an abundant number, since it is smaller than the sum of its proper divisors (98070784).

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

66999296 is a wasteful number, since it uses less digits than its factorization.

66999296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759 (or 741 counting only the distinct ones).

The product of its digits is 2834352, while the sum is 56.

The square root of 66999296 is about 8185.3097681151. The cubic root of 66999296 is about 406.1533874874.

The spelling of 66999296 in words is "sixty-six million, nine hundred ninety-nine thousand, two hundred ninety-six".