78278886 has 40 divisors (see below), whose sum is σ = 200463120. Its totient is φ = 22365072.

The previous prime is 78278869. The next prime is 78278887. The reversal of 78278886 is 68887287.

It is a super-2 number, since 2×78278886² = 12255167986801992, which contains 22 as substring.

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 (78278887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 33381 + ... + 35648.

It is an arithmetic number, because the mean of its divisors is an integer number (5011578).

Almost surely, 2^78278886 is an apocalyptic number.

78278886 is an abundant number, since it is smaller than the sum of its proper divisors (122184234).

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

78278886 is a wasteful number, since it uses less digits than its factorization.

78278886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69050 (or 69041 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 54.

The square root of 78278886 is about 8847.5355890779. The cubic root of 78278886 is about 427.7744866947.

The spelling of 78278886 in words is "seventy-eight million, two hundred seventy-eight thousand, eight hundred eighty-six".