68878458 has 128 divisors (see below), whose sum is σ = 186624000. Its totient is φ = 18558720.

The previous prime is 68878457. The next prime is 68878529. The reversal of 68878458 is 85487886.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (68878457) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 191683 + ... + 192041.

It is an arithmetic number, because the mean of its divisors is an integer number (1458000).

Almost surely, 2^68878458 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68878458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93312000).

68878458 is an abundant number, since it is smaller than the sum of its proper divisors (117745542).

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

68878458 is a wasteful number, since it uses less digits than its factorization.

68878458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 411 counting only the distinct ones).

The product of its digits is 3440640, while the sum is 54.

The square root of 68878458 is about 8299.3046696696. The cubic root of 68878458 is about 409.9156241203.

The spelling of 68878458 in words is "sixty-eight million, eight hundred seventy-eight thousand, four hundred fifty-eight".