68221264 has 40 divisors (see below), whose sum is σ = 135069480. Its totient is φ = 33374208.

The previous prime is 68221261. The next prime is 68221277. The reversal of 68221264 is 46212286.

68221264 = T₃₈₇ + T₃₈₈ + ... + T₇₇₅.

It can be written as a sum of positive squares in 4 ways, for example, as 652864 + 67568400 = 808^2 + 8220^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68221261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175182 + ... + 175570.

It is an arithmetic number, because the mean of its divisors is an integer number (3376737).

Almost surely, 2^68221264 is an apocalyptic number.

It is an amenable number.

68221264 is a deficient number, since it is larger than the sum of its proper divisors (66848216).

68221264 is a wasteful number, since it uses less digits than its factorization.

68221264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607 (or 601 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 68221264 is about 8259.6164559863. The cubic root of 68221264 is about 408.6077384020.

It can be divided in two parts, 682212 and 64, that added together give a square (682276 = 826²).

The spelling of 68221264 in words is "sixty-eight million, two hundred twenty-one thousand, two hundred sixty-four".