7128467978 has 4 divisors (see below), whose sum is σ = 10692701970. Its totient is φ = 3564233988.

The previous prime is 7128467977. The next prime is 7128468007. The reversal of 7128467978 is 8797648217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8797648217 = 73 ⋅120515729.

It can be written as a sum of positive squares in only one way, i.e., 6986786569 + 141681409 = 83587^2 + 11903^2 .

It is not an unprimeable number, because it can be changed into a prime (7128467971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1782116993 + ... + 1782116996.

Almost surely, 2^7128467978 is an apocalyptic number.

7128467978 is a deficient number, since it is larger than the sum of its proper divisors (3564233992).

7128467978 is a wasteful number, since it uses less digits than its factorization.

7128467978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3564233991.

The product of its digits is 9483264, while the sum is 59.

The square root of 7128467978 is about 84430.2551103572. The cubic root of 7128467978 is about 1924.5627142335.

The spelling of 7128467978 in words is "seven billion, one hundred twenty-eight million, four hundred sixty-seven thousand, nine hundred seventy-eight".