78867590 has 32 divisors (see below), whose sum is σ = 153822240. Its totient is φ = 28998144.

The previous prime is 78867589. The next prime is 78867599. The reversal of 78867590 is 9576887.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78867599) 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 15 ways as a sum of consecutive naturals, for example, 1916 + ... + 12704.

It is an arithmetic number, because the mean of its divisors is an integer number (4806945).

Almost surely, 2^78867590 is an apocalyptic number.

78867590 is a deficient number, since it is larger than the sum of its proper divisors (74954650).

78867590 is a wasteful number, since it uses less digits than its factorization.

78867590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10856.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 78867590 is about 8880.7426491257. The cubic root of 78867590 is about 428.8441828301.

The spelling of 78867590 in words is "seventy-eight million, eight hundred sixty-seven thousand, five hundred ninety".