2478581857 has 4 divisors (see below), whose sum is σ = 2479241520. Its totient is φ = 2477922196.

The previous prime is 2478581839. The next prime is 2478581869. The reversal of 2478581857 is 7581858742.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2478581857 is a prime.

It is a super-2 number, since 2×2478581857² = 12286736043699136898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2478581798 and 2478581807.

It is not an unprimeable number, because it can be changed into a prime (2478581837) 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, 324163 + ... + 331720.

It is an arithmetic number, because the mean of its divisors is an integer number (619810380).

Almost surely, 2^2478581857 is an apocalyptic number.

It is an amenable number.

2478581857 is a deficient number, since it is larger than the sum of its proper divisors (659663).

2478581857 is an equidigital number, since it uses as much as digits as its factorization.

2478581857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659662.

The product of its digits is 5017600, while the sum is 55.

The square root of 2478581857 is about 49785.3578575067. The cubic root of 2478581857 is about 1353.3218345272.

The spelling of 2478581857 in words is "two billion, four hundred seventy-eight million, five hundred eighty-one thousand, eight hundred fifty-seven".