25628657678 has 24 divisors (see below), whose sum is σ = 41931539568. Its totient is φ = 11742249792.

The previous prime is 25628657653. The next prime is 25628657713. The reversal of 25628657678 is 87675682652.

It is a happy number.

It is a super-2 number, since 2×25628657678² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25628657678.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 230426 + ... + 323037.

It is an arithmetic number, because the mean of its divisors is an integer number (1747147482).

Almost surely, 2^25628657678 is an apocalyptic number.

25628657678 is a deficient number, since it is larger than the sum of its proper divisors (16302881890).

25628657678 is a wasteful number, since it uses less digits than its factorization.

25628657678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553628 (or 553615 counting only the distinct ones).

The product of its digits is 67737600, while the sum is 62.

The spelling of 25628657678 in words is "twenty-five billion, six hundred twenty-eight million, six hundred fifty-seven thousand, six hundred seventy-eight".