155728525 has 6 divisors (see below), whose sum is σ = 193103402. Its totient is φ = 124582800.

The previous prime is 155728519. The next prime is 155728571. The reversal of 155728525 is 525827551.

It can be written as a sum of positive squares in 3 ways, for example, as 30713764 + 125014761 = 5542^2 + 11181^2 .

It is not a de Polignac number, because 155728525 - 2⁵ = 155728493 is a prime.

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 5 ways as a sum of consecutive naturals, for example, 3114546 + ... + 3114595.

Almost surely, 2^155728525 is an apocalyptic number.

It is an amenable number.

155728525 is a deficient number, since it is larger than the sum of its proper divisors (37374877).

155728525 is an equidigital number, since it uses as much as digits as its factorization.

155728525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6229151 (or 6229146 counting only the distinct ones).

The product of its digits is 140000, while the sum is 40.

The square root of 155728525 is about 12479.1235669818. The cubic root of 155728525 is about 538.0088133049.

The spelling of 155728525 in words is "one hundred fifty-five million, seven hundred twenty-eight thousand, five hundred twenty-five".