2505801728 has 32 divisors (see below), whose sum is σ = 5011592520. Its totient is φ = 1252884480.

The previous prime is 2505801721. The next prime is 2505801733. The reversal of 2505801728 is 8271085052.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 2505801691 and 2505801700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505801721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5468 + ... + 71003.

Almost surely, 2^2505801728 is an apocalyptic number.

It is an amenable number.

2505801728 is a deficient number, since it is larger than the sum of its proper divisors (2505790792).

2505801728 is an frugal number, since it uses more digits than its factorization.

2505801728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76501 (or 76473 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 38.

The square root of 2505801728 is about 50057.9836589529. The cubic root of 2505801728 is about 1358.2578847007.

The spelling of 2505801728 in words is "two billion, five hundred five million, eight hundred one thousand, seven hundred twenty-eight".