212640464 has 10 divisors (see below), whose sum is σ = 411990930. Its totient is φ = 106320224.

The previous prime is 212640427. The next prime is 212640481. The reversal of 212640464 is 464046212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 193210000 + 19430464 = 13900^2 + 4408^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6644999 + ... + 6645030.

It is an arithmetic number, because the mean of its divisors is an integer number (41199093).

Almost surely, 2^212640464 is an apocalyptic number.

It is an amenable number.

212640464 is a deficient number, since it is larger than the sum of its proper divisors (199350466).

212640464 is a wasteful number, since it uses less digits than its factorization.

212640464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13290037 (or 13290031 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 212640464 is about 14582.1968166665. The cubic root of 212640464 is about 596.8730504729.

Adding to 212640464 its reverse (464046212), we get a palindrome (676686676).

The spelling of 212640464 in words is "two hundred twelve million, six hundred forty thousand, four hundred sixty-four".