68263440 has 160 divisors (see below), whose sum is σ = 244270080. Its totient is φ = 15447552.

The previous prime is 68263439. The next prime is 68263441. The reversal of 68263440 is 4436286.

It is an interprime number because it is at equal distance from previous prime (68263439) and next prime (68263441).

It is not an unprimeable number, because it can be changed into a prime (68263441) 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, 300607 + ... + 300833.

It is an arithmetic number, because the mean of its divisors is an integer number (1526688).

Almost surely, 2^68263440 is an apocalyptic number.

68263440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68263440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122135040).

68263440 is an abundant number, since it is smaller than the sum of its proper divisors (176006640).

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

68263440 is a wasteful number, since it uses less digits than its factorization.

68263440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 68263440 is about 8262.1692066914. The cubic root of 68263440 is about 408.6919247139.

The spelling of 68263440 in words is "sixty-eight million, two hundred sixty-three thousand, four hundred forty".