78173994 has 16 divisors (see below), whose sum is σ = 156574080. Its totient is φ = 26020320.

The previous prime is 78173947. The next prime is 78174049. The reversal of 78173994 is 49937187.

It is a super-2 number, since 2×78173994² = 12222346675824072, 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 in 7 ways as a sum of consecutive naturals, for example, 4747 + ... + 13374.

It is an arithmetic number, because the mean of its divisors is an integer number (9785880).

Almost surely, 2^78173994 is an apocalyptic number.

78173994 is an abundant number, since it is smaller than the sum of its proper divisors (78400086).

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

78173994 is a wasteful number, since it uses less digits than its factorization.

78173994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18845.

The product of its digits is 381024, while the sum is 48.

The square root of 78173994 is about 8841.6058496180. The cubic root of 78173994 is about 427.5833317939.

It can be divided in two parts, 7817 and 3994, that added together give a palindrome (11811).

The spelling of 78173994 in words is "seventy-eight million, one hundred seventy-three thousand, nine hundred ninety-four".