2478656 has 14 divisors (see below), whose sum is σ = 4918710. Its totient is φ = 1239296.

The previous prime is 2478653. The next prime is 2478661. The reversal of 2478656 is 6568742.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1478656 + 1000000 = 1216^2 + 1000^2 .

It is a super-2 number, since 2×2478656² = 12287471132672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2478653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19301 + ... + 19428.

2^2478656 is an apocalyptic number.

It is an amenable number.

2478656 is a deficient number, since it is larger than the sum of its proper divisors (2440054).

2478656 is an equidigital number, since it uses as much as digits as its factorization.

2478656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38741 (or 38731 counting only the distinct ones).

The product of its digits is 80640, while the sum is 38.

The square root of 2478656 is about 1574.3747965462. The cubic root of 2478656 is about 135.3335328580. Note that the first 3 decimals are identical.

It can be divided in two parts, 24786 and 56, that added together give a palindrome (24842).

The spelling of 2478656 in words is "two million, four hundred seventy-eight thousand, six hundred fifty-six".