2540078815 has 4 divisors (see below), whose sum is σ = 3048094584. Its totient is φ = 2032063048.

The previous prime is 2540078809. The next prime is 2540078819. The reversal of 2540078815 is 5188700452.

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

It is a cyclic number.

It is not a de Polignac number, because 2540078815 - 2⁷ = 2540078687 is a prime.

It is a super-3 number, since 3×2540078815³ (a number of 29 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540078819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254007877 + ... + 254007886.

It is an arithmetic number, because the mean of its divisors is an integer number (762023646).

Almost surely, 2^2540078815 is an apocalyptic number.

2540078815 is a deficient number, since it is larger than the sum of its proper divisors (508015769).

2540078815 is an equidigital number, since it uses as much as digits as its factorization.

2540078815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508015768.

The product of its (nonzero) digits is 89600, while the sum is 40.

The square root of 2540078815 is about 50399.1945868185. The cubic root of 2540078815 is about 1364.4231019387.

The spelling of 2540078815 in words is "two billion, five hundred forty million, seventy-eight thousand, eight hundred fifteen".