51504732 has 18 divisors (see below), whose sum is σ = 130192608. Its totient is φ = 17168232.

The previous prime is 51504731. The next prime is 51504743. The reversal of 51504732 is 23740515.

It is a happy number.

51504732 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×51504732³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51504696 and 51504705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51504731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 715308 + ... + 715379.

Almost surely, 2^51504732 is an apocalyptic number.

It is an amenable number.

51504732 is an abundant number, since it is smaller than the sum of its proper divisors (78687876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51504732 is a wasteful number, since it uses less digits than its factorization.

51504732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430697 (or 1430692 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 51504732 is about 7176.6797336930. The cubic root of 51504732 is about 372.0623378015.

The spelling of 51504732 in words is "fifty-one million, five hundred four thousand, seven hundred thirty-two".