128015725 has 6 divisors (see below), whose sum is σ = 158739530. Its totient is φ = 102412560.

The previous prime is 128015717. The next prime is 128015743. The reversal of 128015725 is 527510821.

It can be written as a sum of positive squares in 3 ways, for example, as 1205604 + 126810121 = 1098^2 + 11261^2 .

It is not a de Polignac number, because 128015725 - 2³ = 128015717 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2560290 + ... + 2560339.

Almost surely, 2^128015725 is an apocalyptic number.

It is an amenable number.

128015725 is a deficient number, since it is larger than the sum of its proper divisors (30723805).

128015725 is an equidigital number, since it uses as much as digits as its factorization.

128015725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5120639 (or 5120634 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 128015725 is about 11314.4034310254. The cubic root of 128015725 is about 503.9890568822.

The spelling of 128015725 in words is "one hundred twenty-eight million, fifteen thousand, seven hundred twenty-five".