7445728278 has 16 divisors (see below), whose sum is σ = 16546062960. Its totient is φ = 2481909408.

The previous prime is 7445728271. The next prime is 7445728307. The reversal of 7445728278 is 8728275447.

7445728278 is a `hidden beast` number, since 7 + 44 + 572 + 8 + 27 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 137883857 = 7445728278 / (7 + 4 + 4 + 5 + 7 + 2 + 8 + 2 + 7 + 8).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7445728271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68941875 + ... + 68941982.

It is an arithmetic number, because the mean of its divisors is an integer number (1034128935).

Almost surely, 2^7445728278 is an apocalyptic number.

7445728278 is an abundant number, since it is smaller than the sum of its proper divisors (9100334682).

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

7445728278 is a wasteful number, since it uses less digits than its factorization.

7445728278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137883868 (or 137883862 counting only the distinct ones).

The product of its digits is 7024640, while the sum is 54.

The square root of 7445728278 is about 86288.6335388387. The cubic root of 7445728278 is about 1952.7009058231.

The spelling of 7445728278 in words is "seven billion, four hundred forty-five million, seven hundred twenty-eight thousand, two hundred seventy-eight".