2578647457 has 8 divisors (see below), whose sum is σ = 2614695336. Its totient is φ = 2542831872.

The previous prime is 2578647439. The next prime is 2578647469. The reversal of 2578647457 is 7547468752.

It can be written as a sum of positive squares in 4 ways, for example, as 266864896 + 2311782561 = 16336^2 + 48081^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-2578647457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2578647398 and 2578647407.

It is not an unprimeable number, because it can be changed into a prime (2578647437) 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, 35658 + ... + 80179.

It is an arithmetic number, because the mean of its divisors is an integer number (326836917).

Almost surely, 2^2578647457 is an apocalyptic number.

It is an amenable number.

2578647457 is a deficient number, since it is larger than the sum of its proper divisors (36047879).

2578647457 is a wasteful number, since it uses less digits than its factorization.

2578647457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116147.

The product of its digits is 13171200, while the sum is 55.

The square root of 2578647457 is about 50780.3845692409. The cubic root of 2578647457 is about 1371.2942565172.

The spelling of 2578647457 in words is "two billion, five hundred seventy-eight million, six hundred forty-seven thousand, four hundred fifty-seven".