78378178 has 8 divisors (see below), whose sum is σ = 119223360. Its totient is φ = 38637060.

The previous prime is 78378163. The next prime is 78378203. The reversal of 78378178 is 87187387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78378178² = 12286277573199368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275838 + ... + 276121.

It is an arithmetic number, because the mean of its divisors is an integer number (14902920).

Almost surely, 2^78378178 is an apocalyptic number.

78378178 is a deficient number, since it is larger than the sum of its proper divisors (40845182).

78378178 is a wasteful number, since it uses less digits than its factorization.

78378178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552032.

The product of its digits is 526848, while the sum is 49.

The square root of 78378178 is about 8853.1450908702. The cubic root of 78378178 is about 427.9552789038.

It can be divided in two parts, 783 and 78178, that added together give a square (78961 = 281²).

The spelling of 78378178 in words is "seventy-eight million, three hundred seventy-eight thousand, one hundred seventy-eight".