2478889997 has 4 divisors (see below), whose sum is σ = 2479567836. Its totient is φ = 2478212160.

The previous prime is 2478889993. The next prime is 2478890017. The reversal of 2478889997 is 7999888742.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7999888742 = 2 ⋅3999944371.

It can be written as a sum of positive squares in 2 ways, for example, as 821911561 + 1656978436 = 28669^2 + 40706^2 .

It is a cyclic number.

It is not a de Polignac number, because 2478889997 - 2² = 2478889993 is a prime.

It is a super-2 number, since 2×2478889997² = 12289791234453320018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2478889997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2478889993) 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, 333404 + ... + 340757.

It is an arithmetic number, because the mean of its divisors is an integer number (619891959).

Almost surely, 2^2478889997 is an apocalyptic number.

It is an amenable number.

2478889997 is a deficient number, since it is larger than the sum of its proper divisors (677839).

2478889997 is an equidigital number, since it uses as much as digits as its factorization.

2478889997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677838.

The product of its digits is 146313216, while the sum is 71.

The square root of 2478889997 is about 49788.4524463253. The cubic root of 2478889997 is about 1353.3779143521.

The spelling of 2478889997 in words is "two billion, four hundred seventy-eight million, eight hundred eighty-nine thousand, nine hundred ninety-seven".