68891040 has 192 divisors, whose sum is σ = 248209920. Its totient is φ = 17832960.

The previous prime is 68891027. The next prime is 68891063. The reversal of 68891040 is 4019886.

It is a happy number.

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 = 68890986 and 68891004.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159625 + ... + 160055.

It is an arithmetic number, because the mean of its divisors is an integer number (1292760).

Almost surely, 2^68891040 is an apocalyptic number.

68891040 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 68891040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124104960).

68891040 is an abundant number, since it is smaller than the sum of its proper divisors (179318880).

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

68891040 is a wasteful number, since it uses less digits than its factorization.

68891040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 68891040 is about 8300.0626503660. The cubic root of 68891040 is about 409.9405823076.

The spelling of 68891040 in words is "sixty-eight million, eight hundred ninety-one thousand, forty".