55728025 has 6 divisors (see below), whose sum is σ = 69102782. Its totient is φ = 44582400.

The previous prime is 55728017. The next prime is 55728059. The reversal of 55728025 is 52082755.

It can be written as a sum of positive squares in 3 ways, for example, as 61504 + 55666521 = 248^2 + 7461^2 .

It is not a de Polignac number, because 55728025 - 2³ = 55728017 is a prime.

It is a super-2 number, since 2×55728025² = 6211225540801250, which contains 22 as substring.

It is a Duffinian 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, 1114536 + ... + 1114585.

Almost surely, 2^55728025 is an apocalyptic number.

It is an amenable number.

55728025 is a deficient number, since it is larger than the sum of its proper divisors (13374757).

55728025 is a wasteful number, since it uses less digits than its factorization.

55728025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229131 (or 2229126 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 34.

The square root of 55728025 is about 7465.1205616520. The cubic root of 55728025 is about 381.9658627426.

It can be divided in two parts, 557 and 28025, that added together give a palindrome (28582).

The spelling of 55728025 in words is "fifty-five million, seven hundred twenty-eight thousand, twenty-five".