68225664 has 128 divisors (see below), whose sum is σ = 198777600. Its totient is φ = 20606976.

The previous prime is 68225639. The next prime is 68225683. The reversal of 68225664 is 46652286.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (39).

Its product of digits (138240) is a multiple of the sum of its prime divisors (270).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394282 + ... + 394454.

It is an arithmetic number, because the mean of its divisors is an integer number (1552950).

Almost surely, 2^68225664 is an apocalyptic number.

68225664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68225664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99388800).

68225664 is an abundant number, since it is smaller than the sum of its proper divisors (130551936).

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

68225664 is a wasteful number, since it uses less digits than its factorization.

68225664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 270 counting only the distinct ones).

The product of its digits is 138240, while the sum is 39.

The square root of 68225664 is about 8259.8828078854. The cubic root of 68225664 is about 408.6165227375.

The spelling of 68225664 in words is "sixty-eight million, two hundred twenty-five thousand, six hundred sixty-four".