57278251278 has 16 divisors (see below), whose sum is σ = 127285002960. Its totient is φ = 19092750408.

The previous prime is 57278251237. The next prime is 57278251307. The reversal of 57278251278 is 87215287275.

It is a happy number.

57278251278 is a `hidden beast` number, since 57 + 2 + 7 + 8 + 2 + 512 + 78 = 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: 1060708357 = 57278251278 / (5 + 7 + 2 + 7 + 8 + 2 + 5 + 1 + 2 + 7 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 530354125 + ... + 530354232.

It is an arithmetic number, because the mean of its divisors is an integer number (7955312685).

Almost surely, 2^57278251278 is an apocalyptic number.

57278251278 is an abundant number, since it is smaller than the sum of its proper divisors (70006751682).

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

57278251278 is a wasteful number, since it uses less digits than its factorization.

57278251278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060708368 (or 1060708362 counting only the distinct ones).

The product of its digits is 4390400, while the sum is 54.

The spelling of 57278251278 in words is "fifty-seven billion, two hundred seventy-eight million, two hundred fifty-one thousand, two hundred seventy-eight".