68516840 has 32 divisors (see below), whose sum is σ = 176186880. Its totient is φ = 23491392.

The previous prime is 68516837. The next prime is 68516867. The reversal of 68516840 is 4861586.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 68516794 and 68516803.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122072 + ... + 122631.

It is an arithmetic number, because the mean of its divisors is an integer number (5505840).

Almost surely, 2^68516840 is an apocalyptic number.

It is an amenable number.

68516840 is an abundant number, since it is smaller than the sum of its proper divisors (107670040).

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

68516840 is a wasteful number, since it uses less digits than its factorization.

68516840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244721 (or 244717 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 68516840 is about 8277.4899577106. The cubic root of 68516840 is about 409.1970006026.

The spelling of 68516840 in words is "sixty-eight million, five hundred sixteen thousand, eight hundred forty".