78641178 has 48 divisors (see below), whose sum is σ = 199602144. Its totient is φ = 20425440.

The previous prime is 78641161. The next prime is 78641191. The reversal of 78641178 is 87114687.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8925 + ... + 15392.

It is an arithmetic number, because the mean of its divisors is an integer number (4158378).

Almost surely, 2^78641178 is an apocalyptic number.

78641178 is an abundant number, since it is smaller than the sum of its proper divisors (120960966).

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

78641178 is a wasteful number, since it uses less digits than its factorization.

78641178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24347 (or 24340 counting only the distinct ones).

The product of its digits is 75264, while the sum is 42.

The square root of 78641178 is about 8867.9861298944. The cubic root of 78641178 is about 428.4334161640.

The spelling of 78641178 in words is "seventy-eight million, six hundred forty-one thousand, one hundred seventy-eight".