2604145781 has 4 divisors (see below), whose sum is σ = 2604353292. Its totient is φ = 2603938272.

The previous prime is 2604145769. The next prime is 2604145783. The reversal of 2604145781 is 1875414062.

2604145781 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 1078071556 + 1526074225 = 32834^2 + 39065^2 .

It is a cyclic number.

It is not a de Polignac number, because 2604145781 - 2³⁰ = 1530403957 is a prime.

It is a super-2 number, since 2×2604145781² = 13563150497400199922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2604145783) 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, 83630 + ... + 110463.

It is an arithmetic number, because the mean of its divisors is an integer number (651088323).

Almost surely, 2^2604145781 is an apocalyptic number.

It is an amenable number.

2604145781 is a deficient number, since it is larger than the sum of its proper divisors (207511).

2604145781 is a wasteful number, since it uses less digits than its factorization.

2604145781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207510.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 2604145781 is about 51030.8316706675. The cubic root of 2604145781 is about 1375.7993423388.

The spelling of 2604145781 in words is "two billion, six hundred four million, one hundred forty-five thousand, seven hundred eighty-one".