68638456 has 8 divisors (see below), whose sum is σ = 128697120. Its totient is φ = 34319224.

The previous prime is 68638403. The next prime is 68638457. The reversal of 68638456 is 65483686.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×68638456² = 9422475284127872, which contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68638457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4289896 + ... + 4289911.

It is an arithmetic number, because the mean of its divisors is an integer number (16087140).

Almost surely, 2^68638456 is an apocalyptic number.

It is an amenable number.

68638456 is a deficient number, since it is larger than the sum of its proper divisors (60058664).

68638456 is a wasteful number, since it uses less digits than its factorization.

68638456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8579813 (or 8579809 counting only the distinct ones).

The product of its digits is 829440, while the sum is 46.

The square root of 68638456 is about 8284.8328890811. The cubic root of 68638456 is about 409.4389629559.

The spelling of 68638456 in words is "sixty-eight million, six hundred thirty-eight thousand, four hundred fifty-six".