78868878 has 32 divisors (see below), whose sum is σ = 173335680. Its totient is φ = 23724960.

The previous prime is 78868873. The next prime is 78868883. The reversal of 78868878 is 87886887.

It is an interprime number because it is at equal distance from previous prime (78868873) and next prime (78868883).

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78868873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4876 + ... + 13472.

It is an arithmetic number, because the mean of its divisors is an integer number (5416740).

Almost surely, 2^78868878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78868878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86667840).

78868878 is an abundant number, since it is smaller than the sum of its proper divisors (94466802).

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

78868878 is a wasteful number, since it uses less digits than its factorization.

78868878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8752.

The product of its digits is 9633792, while the sum is 60.

The square root of 78868878 is about 8880.8151652875. The cubic root of 78868878 is about 428.8465173265.

Subtracting 78868878 from its reverse (87886887), we obtain a square (9018009 = 3003²).

The spelling of 78868878 in words is "seventy-eight million, eight hundred sixty-eight thousand, eight hundred seventy-eight".