66868776 has 96 divisors (see below), whose sum is σ = 196560000. Its totient is φ = 20414592.

The previous prime is 66868759. The next prime is 66868777. The reversal of 66868776 is 67786866.

Its product of digits (4064256) is a multiple of the sum of its prime divisors (576).

It is not an unprimeable number, because it can be changed into a prime (66868777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 186085 + ... + 186443.

It is an arithmetic number, because the mean of its divisors is an integer number (2047500).

Almost surely, 2^66868776 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 66868776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98280000).

66868776 is an abundant number, since it is smaller than the sum of its proper divisors (129691224).

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

66868776 is a wasteful number, since it uses less digits than its factorization.

66868776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 576 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The square root of 66868776 is about 8177.3330615794. Note that the first 3 decimals coincide. The cubic root of 66868776 is about 405.8894762529.

Adding to 66868776 its sum of digits (54), we get a triangular number (66868830 = T₁₁₅₆₄).

The spelling of 66868776 in words is "sixty-six million, eight hundred sixty-eight thousand, seven hundred seventy-six".