7278843745 has 4 divisors (see below), whose sum is σ = 8734612500. Its totient is φ = 5823074992.

The previous prime is 7278843683. The next prime is 7278843749. The reversal of 7278843745 is 5473488727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5473488727 = 7 ⋅781926961.

It can be written as a sum of positive squares in 2 ways, for example, as 5531938129 + 1746905616 = 74377^2 + 41796^2 .

It is a cyclic number.

It is not a de Polignac number, because 7278843745 - 2²¹ = 7276746593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7278843749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 727884370 + ... + 727884379.

It is an arithmetic number, because the mean of its divisors is an integer number (2183653125).

Almost surely, 2^7278843745 is an apocalyptic number.

It is an amenable number.

7278843745 is a deficient number, since it is larger than the sum of its proper divisors (1455768755).

7278843745 is a wasteful number, since it uses less digits than its factorization.

7278843745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455768754.

The product of its digits is 10536960, while the sum is 55.

The square root of 7278843745 is about 85316.1400029326. The cubic root of 7278843745 is about 1938.0016039879.

The spelling of 7278843745 in words is "seven billion, two hundred seventy-eight million, eight hundred forty-three thousand, seven hundred forty-five".