66431196 has 108 divisors (see below), whose sum is σ = 185847480. Its totient is φ = 19992960.

The previous prime is 66431177. The next prime is 66431219. The reversal of 66431196 is 69113466.

66431196 is a `hidden beast` number, since 6 + 643 + 1 + 1 + 9 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 66431196.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 371035 + ... + 371213.

It is an arithmetic number, because the mean of its divisors is an integer number (1720810).

Almost surely, 2^66431196 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 66431196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92923740).

66431196 is an abundant number, since it is smaller than the sum of its proper divisors (119416284).

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

66431196 is a wasteful number, since it uses less digits than its factorization.

66431196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 258 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 66431196 is about 8150.5334794724. The cubic root of 66431196 is about 405.0021764858.

The spelling of 66431196 in words is "sixty-six million, four hundred thirty-one thousand, one hundred ninety-six".