68742644 has 12 divisors (see below), whose sum is σ = 124448100. Its totient is φ = 33186048.

The previous prime is 68742631. The next prime is 68742671. The reversal of 68742644 is 44624786.

It can be written as a sum of positive squares in 2 ways, for example, as 47472100 + 21270544 = 6890^2 + 4612^2 .

It is a super-2 number, since 2×68742644² = 9451102208221472, which contains 22 as substring.

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, 296189 + ... + 296420.

It is an arithmetic number, because the mean of its divisors is an integer number (10370675).

Almost surely, 2^68742644 is an apocalyptic number.

It is an amenable number.

68742644 is a deficient number, since it is larger than the sum of its proper divisors (55705456).

68742644 is a wasteful number, since it uses less digits than its factorization.

68742644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592642 (or 592640 counting only the distinct ones).

The product of its digits is 258048, while the sum is 41.

The square root of 68742644 is about 8291.1183805323. The cubic root of 68742644 is about 409.6460240464.

The spelling of 68742644 in words is "sixty-eight million, seven hundred forty-two thousand, six hundred forty-four".