68644356 has 48 divisors (see below), whose sum is σ = 175280448. Its totient is φ = 20736000.

The previous prime is 68644339. The next prime is 68644357. The reversal of 68644356 is 65344686.

It is a super-2 number, since 2×68644356² = 9424095221309472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68644357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56556 + ... + 57756.

It is an arithmetic number, because the mean of its divisors is an integer number (3651676).

Almost surely, 2^68644356 is an apocalyptic number.

68644356 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

68644356 is an abundant number, since it is smaller than the sum of its proper divisors (106636092).

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

68644356 is a wasteful number, since it uses less digits than its factorization.

68644356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652 (or 1650 counting only the distinct ones).

The product of its digits is 414720, while the sum is 42.

The square root of 68644356 is about 8285.1889537898. The cubic root of 68644356 is about 409.4506940893.

The spelling of 68644356 in words is "sixty-eight million, six hundred forty-four thousand, three hundred fifty-six".