78827778 has 48 divisors (see below), whose sum is σ = 174841056. Its totient is φ = 25660800.

The previous prime is 78827743. The next prime is 78827779. The reversal of 78827778 is 87772887.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (78827779) 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, 196378 + ... + 196778.

It is an arithmetic number, because the mean of its divisors is an integer number (3642522).

Almost surely, 2^78827778 is an apocalyptic number.

78827778 is an abundant number, since it is smaller than the sum of its proper divisors (96013278).

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

78827778 is a wasteful number, since it uses less digits than its factorization.

78827778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 636 counting only the distinct ones).

The product of its digits is 2458624, while the sum is 54.

The square root of 78827778 is about 8878.5008869741. The cubic root of 78827778 is about 428.7720111551.

The spelling of 78827778 in words is "seventy-eight million, eight hundred twenty-seven thousand, seven hundred seventy-eight".