78090858 has 64 divisors (see below), whose sum is σ = 178679040. Its totient is φ = 25272000.

The previous prime is 78090839. The next prime is 78090863. The reversal of 78090858 is 85809087.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 497316 + ... + 497472.

It is an arithmetic number, because the mean of its divisors is an integer number (2791860).

Almost surely, 2^78090858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78090858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89339520).

78090858 is an abundant number, since it is smaller than the sum of its proper divisors (100588182).

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

78090858 is a wasteful number, since it uses less digits than its factorization.

78090858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The square root of 78090858 is about 8836.9031905979. The cubic root of 78090858 is about 427.4317034633.

The spelling of 78090858 in words is "seventy-eight million, ninety thousand, eight hundred fifty-eight".