78455716 has 6 divisors (see below), whose sum is σ = 137297510. Its totient is φ = 39227856.

The previous prime is 78455711. The next prime is 78455723. The reversal of 78455716 is 61755487.

It can be written as a sum of positive squares in only one way, i.e., 68558400 + 9897316 = 8280^2 + 3146^2 .

It is not an unprimeable number, because it can be changed into a prime (78455711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9806961 + ... + 9806968.

Almost surely, 2^78455716 is an apocalyptic number.

It is an amenable number.

78455716 is a deficient number, since it is larger than the sum of its proper divisors (58841794).

78455716 is a wasteful number, since it uses less digits than its factorization.

78455716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19613933 (or 19613931 counting only the distinct ones).

The product of its digits is 235200, while the sum is 43.

The square root of 78455716 is about 8857.5231300855. The cubic root of 78455716 is about 428.0963549911.

The spelling of 78455716 in words is "seventy-eight million, four hundred fifty-five thousand, seven hundred sixteen".