2478897493 has 4 divisors (see below), whose sum is σ = 2487358188. Its totient is φ = 2470436800.

The previous prime is 2478897481. The next prime is 2478897541. The reversal of 2478897493 is 3947988742.

2478897493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1772241604 + 706655889 = 42098^2 + 26583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2478897493 is a prime.

It is a super-2 number, since 2×2478897493² = 12289865561603370098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2478897413) 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, 4229908 + ... + 4230493.

It is an arithmetic number, because the mean of its divisors is an integer number (621839547).

Almost surely, 2^2478897493 is an apocalyptic number.

It is an amenable number.

2478897493 is a deficient number, since it is larger than the sum of its proper divisors (8460695).

2478897493 is an equidigital number, since it uses as much as digits as its factorization.

2478897493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8460694.

The product of its digits is 24385536, while the sum is 61.

The square root of 2478897493 is about 49788.5277247681. The cubic root of 2478897493 is about 1353.3792785260.

The spelling of 2478897493 in words is "two billion, four hundred seventy-eight million, eight hundred ninety-seven thousand, four hundred ninety-three".