68978658 has 48 divisors (see below), whose sum is σ = 163010880. Its totient is φ = 19061280.

The previous prime is 68978641. The next prime is 68978659. The reversal of 68978658 is 85687986.

It is a junction number, because it is equal to n+sod(n) for n = 68978598 and 68978607.

It is not an unprimeable number, because it can be changed into a prime (68978659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39508 + ... + 41216.

It is an arithmetic number, because the mean of its divisors is an integer number (3396060).

Almost surely, 2^68978658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68978658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81505440).

68978658 is an abundant number, since it is smaller than the sum of its proper divisors (94032222).

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

68978658 is a wasteful number, since it uses less digits than its factorization.

68978658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783 (or 1752 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 57.

The square root of 68978658 is about 8305.3391261284. The cubic root of 68978658 is about 410.1143008704.

The spelling of 68978658 in words is "sixty-eight million, nine hundred seventy-eight thousand, six hundred fifty-eight".