66976686 has 64 divisors (see below), whose sum is σ = 171279360. Its totient is φ = 19003680.

The previous prime is 66976681. The next prime is 66976687. The reversal of 66976686 is 68667966.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66976681) 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, 62596 + ... + 63656.

It is an arithmetic number, because the mean of its divisors is an integer number (2676240).

Almost surely, 2^66976686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66976686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85639680).

66976686 is an abundant number, since it is smaller than the sum of its proper divisors (104302674).

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

66976686 is a wasteful number, since it uses less digits than its factorization.

66976686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246 (or 1240 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 66976686 is about 8183.9285187494. The cubic root of 66976686 is about 406.1076946626.

The spelling of 66976686 in words is "sixty-six million, nine hundred seventy-six thousand, six hundred eighty-six".