25728470720397 has 24 divisors (see below), whose sum is σ = 39888459055224. Its totient is φ = 15922212332544.

The previous prime is 25728470720389. The next prime is 25728470720437. The reversal of 25728470720397 is 79302707482752.

25728470720397 is a `hidden beast` number, since 2 + 5 + 7 + 2 + 8 + 470 + 72 + 0 + 3 + 97 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7981410369321 + 17747060351076 = 2825139^2 + 4212726^2 .

It is not a de Polignac number, because 25728470720397 - 2³ = 25728470720389 is a prime.

It is a super-2 number, since 2×25728470720397² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25728470720327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1151769238 + ... + 1151791575.

It is an arithmetic number, because the mean of its divisors is an integer number (1662019127301).

Almost surely, 2^{25728470720397} is an apocalyptic number.

It is an amenable number.

25728470720397 is a deficient number, since it is larger than the sum of its proper divisors (14159988334827).

25728470720397 is a wasteful number, since it uses less digits than its factorization.

25728470720397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303560909 (or 2303560906 counting only the distinct ones).

The product of its (nonzero) digits is 82978560, while the sum is 63.

The spelling of 25728470720397 in words is "twenty-five trillion, seven hundred twenty-eight billion, four hundred seventy million, seven hundred twenty thousand, three hundred ninety-seven".