25678728073 has 4 divisors (see below), whose sum is σ = 25679069568. Its totient is φ = 25678386580.

The previous prime is 25678728037. The next prime is 25678728121. The reversal of 25678728073 is 37082787652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25678728073 - 2⁹ = 25678727561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25678728013) 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, 3061 + ... + 226642.

It is an arithmetic number, because the mean of its divisors is an integer number (6419767392).

Almost surely, 2^25678728073 is an apocalyptic number.

It is an amenable number.

25678728073 is a deficient number, since it is larger than the sum of its proper divisors (341495).

25678728073 is a wasteful number, since it uses less digits than its factorization.

25678728073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341494.

The product of its (nonzero) digits is 7902720, while the sum is 55.

The spelling of 25678728073 in words is "twenty-five billion, six hundred seventy-eight million, seven hundred twenty-eight thousand, seventy-three".