68211640 has 32 divisors (see below), whose sum is σ = 175402080. Its totient is φ = 23386752.

The previous prime is 68211623. The next prime is 68211643. The reversal of 68211640 is 4611286.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 68211599 and 68211608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68211643) 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 7 ways as a sum of consecutive naturals, for example, 121527 + ... + 122086.

It is an arithmetic number, because the mean of its divisors is an integer number (5481315).

Almost surely, 2^68211640 is an apocalyptic number.

It is an amenable number.

68211640 is an abundant number, since it is smaller than the sum of its proper divisors (107190440).

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

68211640 is a wasteful number, since it uses less digits than its factorization.

68211640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243631 (or 243627 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 68211640 is about 8259.0338418001. The cubic root of 68211640 is about 408.5885233481.

The spelling of 68211640 in words is "sixty-eight million, two hundred eleven thousand, six hundred forty".