664212892 has 12 divisors (see below), whose sum is σ = 1328425840. Its totient is φ = 284662656.

The previous prime is 664212877. The next prime is 664212931. The reversal of 664212892 is 298212466.

664212892 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11860917 + ... + 11860972.

Almost surely, 2^664212892 is an apocalyptic number.

It is an amenable number.

664212892 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

664212892 is a wasteful number, since it uses less digits than its factorization.

664212892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23721900 (or 23721898 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 664212892 is about 25772.3280283330. The cubic root of 664212892 is about 872.5073622748.

It can be divided in two parts, 66 and 4212892, that multiplied together give a palindrome (278050872).

The spelling of 664212892 in words is "six hundred sixty-four million, two hundred twelve thousand, eight hundred ninety-two".