78190886 has 4 divisors (see below), whose sum is σ = 117286332. Its totient is φ = 39095442.

The previous prime is 78190841. The next prime is 78190901. The reversal of 78190886 is 68809187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68809187 = 2591 ⋅26557.

It is a super-2 number, since 2×78190886² = 12227629306929992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78190886.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19547720 + ... + 19547723.

It is an arithmetic number, because the mean of its divisors is an integer number (29321583).

Almost surely, 2^78190886 is an apocalyptic number.

78190886 is a deficient number, since it is larger than the sum of its proper divisors (39095446).

78190886 is a wasteful number, since it uses less digits than its factorization.

78190886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39095445.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 78190886 is about 8842.5610543552. The cubic root of 78190886 is about 427.6141272759.

The spelling of 78190886 in words is "seventy-eight million, one hundred ninety thousand, eight hundred eighty-six".