68921740 has 96 divisors (see below), whose sum is σ = 165473280. Its totient is φ = 23952384.

The previous prime is 68921737. The next prime is 68921747. The reversal of 68921740 is 4712986.

68921740 = T₁₆₈₉ + T₁₆₉₀ + ... + T₁₇₃₅.

It is a self number, because there is not a number n which added to its sum of digits gives 68921740.

It is not an unprimeable number, because it can be changed into a prime (68921747) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 303507 + ... + 303733.

It is an arithmetic number, because the mean of its divisors is an integer number (1723680).

Almost surely, 2^68921740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68921740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82736640).

68921740 is an abundant number, since it is smaller than the sum of its proper divisors (96551540).

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

68921740 is a wasteful number, since it uses less digits than its factorization.

68921740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 68921740 is about 8301.9118280068. The cubic root of 68921740 is about 410.0014673753.

The spelling of 68921740 in words is "sixty-eight million, nine hundred twenty-one thousand, seven hundred forty".