66431288 has 32 divisors (see below), whose sum is σ = 155295360. Its totient is φ = 25882080.

The previous prime is 66431273. The next prime is 66431303. The reversal of 66431288 is 88213466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66431273) and next prime (66431303).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53306 + ... + 54537.

It is an arithmetic number, because the mean of its divisors is an integer number (4852980).

Almost surely, 2^66431288 is an apocalyptic number.

It is an amenable number.

66431288 is an abundant number, since it is smaller than the sum of its proper divisors (88864072).

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

66431288 is a wasteful number, since it uses less digits than its factorization.

66431288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107867 (or 107863 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 66431288 is about 8150.5391232728. The cubic root of 66431288 is about 405.0023634471.

The spelling of 66431288 in words is "sixty-six million, four hundred thirty-one thousand, two hundred eighty-eight".