51648725 has 18 divisors (see below), whose sum is σ = 65697990. Its totient is φ = 40278400.

The previous prime is 51648721. The next prime is 51648733. The reversal of 51648725 is 52784615.

It can be written as a sum of positive squares in 9 ways, for example, as 24671089 + 26977636 = 4967^2 + 5194^2 .

It is not a de Polignac number, because 51648725 - 2² = 51648721 is a prime.

It is a super-3 number, since 3×51648725³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51648721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 41411 + ... + 42639.

Almost surely, 2^51648725 is an apocalyptic number.

It is an amenable number.

51648725 is a deficient number, since it is larger than the sum of its proper divisors (14049265).

51648725 is a wasteful number, since it uses less digits than its factorization.

51648725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321 (or 1275 counting only the distinct ones).

The product of its digits is 67200, while the sum is 38.

The square root of 51648725 is about 7186.7047386128. The cubic root of 51648725 is about 372.4087430161.

The spelling of 51648725 in words is "fifty-one million, six hundred forty-eight thousand, seven hundred twenty-five".