28400253725 has 12 divisors (see below), whose sum is σ = 36168108084. Its totient is φ = 22106142720.

The previous prime is 28400253719. The next prime is 28400253751. The reversal of 28400253725 is 52735200482.

It can be written as a sum of positive squares in 6 ways, for example, as 325910809 + 28074342916 = 18053^2 + 167554^2 .

It is not a de Polignac number, because 28400253725 - 2²² = 28396059421 is a prime.

It is a super-4 number, since 4×28400253725⁴ (a number of 43 digits) contains 4444 as substring.

It is a Duffinian number.

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, 15350564 + ... + 15352413.

It is an arithmetic number, because the mean of its divisors is an integer number (3014009007).

Almost surely, 2^28400253725 is an apocalyptic number.

28400253725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28400253725 is a deficient number, since it is larger than the sum of its proper divisors (7767854359).

28400253725 is a wasteful number, since it uses less digits than its factorization.

28400253725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30703024 (or 30703019 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 38.

The spelling of 28400253725 in words is "twenty-eight billion, four hundred million, two hundred fifty-three thousand, seven hundred twenty-five".