78867390 has 32 divisors (see below), whose sum is σ = 216322560. Its totient is φ = 18026784.

The previous prime is 78867377. The next prime is 78867431. The reversal of 78867390 is 9376887.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187570 + ... + 187989.

It is an arithmetic number, because the mean of its divisors is an integer number (6760080).

Almost surely, 2^78867390 is an apocalyptic number.

78867390 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78867390 is an abundant number, since it is smaller than the sum of its proper divisors (137455170).

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

78867390 is a wasteful number, since it uses less digits than its factorization.

78867390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375576.

The product of its (nonzero) digits is 508032, while the sum is 48.

The square root of 78867390 is about 8880.7313887990. The cubic root of 78867390 is about 428.8438203284.

The spelling of 78867390 in words is "seventy-eight million, eight hundred sixty-seven thousand, three hundred ninety".