68731740 has 480 divisors, whose sum is σ = 292723200. Its totient is φ = 13063680.

The previous prime is 68731717. The next prime is 68731753. The reversal of 68731740 is 4713786.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 68731695 and 68731704.

It is a congruent number.

It is an unprimeable number.

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 159 ways as a sum of consecutive naturals, for example, 2370046 + ... + 2370074.

It is an arithmetic number, because the mean of its divisors is an integer number (609840).

Almost surely, 2^68731740 is an apocalyptic number.

68731740 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 68731740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146361600).

68731740 is an abundant number, since it is smaller than the sum of its proper divisors (223991460).

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

68731740 is a wasteful number, since it uses less digits than its factorization.

68731740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 68731740 is about 8290.4607833341. The cubic root of 68731740 is about 409.6243634673.

The spelling of 68731740 in words is "sixty-eight million, seven hundred thirty-one thousand, seven hundred forty".