68644842 has 64 divisors (see below), whose sum is σ = 162729984. Its totient is φ = 18895680.

The previous prime is 68644837. The next prime is 68644909. The reversal of 68644842 is 24844686.

It is a super-2 number, since 2×68644842² = 9424228666409928, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 68644794 and 68644803.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253167 + ... + 253437.

It is an arithmetic number, because the mean of its divisors is an integer number (2542656).

Almost surely, 2^68644842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68644842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81364992).

68644842 is an abundant number, since it is smaller than the sum of its proper divisors (94085142).

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

68644842 is a wasteful number, since it uses less digits than its factorization.

68644842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483.

The product of its digits is 294912, while the sum is 42.

The square root of 68644842 is about 8285.2182831836. The cubic root of 68644842 is about 409.4516603866.

The spelling of 68644842 in words is "sixty-eight million, six hundred forty-four thousand, eight hundred forty-two".