68644900 has 18 divisors (see below), whose sum is σ = 148959650. Its totient is φ = 27457920.

The previous prime is 68644837. The next prime is 68644909. The reversal of 68644900 is 944686.

It can be written as a sum of positive squares in 3 ways, for example, as 8054244 + 60590656 = 2838^2 + 7784^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 68644900.

It is not an unprimeable number, because it can be changed into a prime (68644909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 343125 + ... + 343324.

Almost surely, 2^68644900 is an apocalyptic number.

It is an amenable number.

68644900 is an abundant number, since it is smaller than the sum of its proper divisors (80314750).

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

68644900 is a wasteful number, since it uses less digits than its factorization.

68644900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686463 (or 686456 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 68644900 is about 8285.2217833924. The cubic root of 68644900 is about 409.4517757058.

It can be divided in two parts, 68644 and 900, that multiplied together give a square (61779600 = 7860²).

The spelling of 68644900 in words is "sixty-eight million, six hundred forty-four thousand, nine hundred".