78191852 has 6 divisors (see below), whose sum is σ = 136835748. Its totient is φ = 39095924.

The previous prime is 78191849. The next prime is 78191873. The reversal of 78191852 is 25819187.

It is a super-2 number, since 2×78191852² = 12227931438379808, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 9773978 + ... + 9773985.

It is an arithmetic number, because the mean of its divisors is an integer number (22805958).

Almost surely, 2^78191852 is an apocalyptic number.

It is an amenable number.

78191852 is a deficient number, since it is larger than the sum of its proper divisors (58643896).

78191852 is a wasteful number, since it uses less digits than its factorization.

78191852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19547967 (or 19547965 counting only the distinct ones).

The product of its digits is 40320, while the sum is 41.

The square root of 78191852 is about 8842.6156763709. The cubic root of 78191852 is about 427.6158882380.

It can be divided in two parts, 7819185 and 2, that added together give a palindrome (7819187).

The spelling of 78191852 in words is "seventy-eight million, one hundred ninety-one thousand, eight hundred fifty-two".