66861732 has 96 divisors (see below), whose sum is σ = 185213952. Its totient is φ = 18377856.

The previous prime is 66861727. The next prime is 66861737. The reversal of 66861732 is 23716866.

It is an interprime number because it is at equal distance from previous prime (66861727) and next prime (66861737).

It is not an unprimeable number, because it can be changed into a prime (66861737) 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, 386398 + ... + 386570.

It is an arithmetic number, because the mean of its divisors is an integer number (1929312).

Almost surely, 2^66861732 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 66861732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92606976).

66861732 is an abundant number, since it is smaller than the sum of its proper divisors (118352220).

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

66861732 is a wasteful number, since it uses less digits than its factorization.

66861732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337 (or 335 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 66861732 is about 8176.9023474663. The cubic root of 66861732 is about 405.8752235327.

The spelling of 66861732 in words is "sixty-six million, eight hundred sixty-one thousand, seven hundred thirty-two".