68778558 has 20 divisors (see below), whose sum is σ = 154115280. Its totient is φ = 22926132.

The previous prime is 68778557. The next prime is 68778587. The reversal of 68778558 is 85587786.

It is a happy number.

68778558 is a `hidden beast` number, since 6 + 87 + 7 + 8 + 558 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68778551) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 212118 + ... + 212441.

It is an arithmetic number, because the mean of its divisors is an integer number (7705764).

Almost surely, 2^68778558 is an apocalyptic number.

68778558 is an abundant number, since it is smaller than the sum of its proper divisors (85336722).

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

68778558 is a wasteful number, since it uses less digits than its factorization.

68778558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424573 (or 424564 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 54.

The square root of 68778558 is about 8293.2839092847. The cubic root of 68778558 is about 409.7173503011.

The spelling of 68778558 in words is "sixty-eight million, seven hundred seventy-eight thousand, five hundred fifty-eight".