2505728642 has 4 divisors (see below), whose sum is σ = 3758592966. Its totient is φ = 1252864320.

The previous prime is 2505728639. The next prime is 2505728677. The reversal of 2505728642 is 2468275052.

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

It can be written as a sum of positive squares in only one way, i.e., 1808715841 + 697012801 = 42529^2 + 26401^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2505728642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626432159 + ... + 626432162.

Almost surely, 2^2505728642 is an apocalyptic number.

2505728642 is a deficient number, since it is larger than the sum of its proper divisors (1252864324).

2505728642 is a wasteful number, since it uses less digits than its factorization.

2505728642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252864323.

The product of its (nonzero) digits is 268800, while the sum is 41.

The square root of 2505728642 is about 50057.2536402068. The cubic root of 2505728642 is about 1358.2446792663.

The spelling of 2505728642 in words is "two billion, five hundred five million, seven hundred twenty-eight thousand, six hundred forty-two".