78147908 has 6 divisors (see below), whose sum is σ = 136758846. Its totient is φ = 39073952.

The previous prime is 78147907. The next prime is 78147913. The reversal of 78147908 is 80974187.

It can be written as a sum of positive squares in only one way, i.e., 68425984 + 9721924 = 8272^2 + 3118^2 .

It is a super-2 number, since 2×78147908² = 12214191049552928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78147907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9768485 + ... + 9768492.

It is an arithmetic number, because the mean of its divisors is an integer number (22793141).

Almost surely, 2^78147908 is an apocalyptic number.

It is an amenable number.

78147908 is a deficient number, since it is larger than the sum of its proper divisors (58610938).

78147908 is a wasteful number, since it uses less digits than its factorization.

78147908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19536981 (or 19536979 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 78147908 is about 8840.1305420226. The cubic root of 78147908 is about 427.5357661901.

The spelling of 78147908 in words is "seventy-eight million, one hundred forty-seven thousand, nine hundred eight".