2545638887 has 8 divisors (see below), whose sum is σ = 2852116752. Its totient is φ = 2251670400.

The previous prime is 2545638881. The next prime is 2545638889. The reversal of 2545638887 is 7888365452.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2545638887 - 2⁸ = 2545638631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2545638881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3126914 + ... + 3127727.

It is an arithmetic number, because the mean of its divisors is an integer number (356514594).

Almost surely, 2^2545638887 is an apocalyptic number.

2545638887 is a deficient number, since it is larger than the sum of its proper divisors (306477865).

2545638887 is a wasteful number, since it uses less digits than its factorization.

2545638887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6254689.

The product of its digits is 12902400, while the sum is 56.

The square root of 2545638887 is about 50454.3247601234. The cubic root of 2545638887 is about 1365.4179217397.

The spelling of 2545638887 in words is "two billion, five hundred forty-five million, six hundred thirty-eight thousand, eight hundred eighty-seven".