51693540 has 24 divisors (see below), whose sum is σ = 144742080. Its totient is φ = 13784928.

The previous prime is 51693539. The next prime is 51693541. The reversal of 51693540 is 4539615.

It is a happy number.

51693540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51693539) and next prime (51693541).

It is not an unprimeable number, because it can be changed into a prime (51693541) 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 7 ways as a sum of consecutive naturals, for example, 430720 + ... + 430839.

It is an arithmetic number, because the mean of its divisors is an integer number (6030920).

Almost surely, 2^51693540 is an apocalyptic number.

It is an amenable number.

51693540 is an abundant number, since it is smaller than the sum of its proper divisors (93048540).

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

51693540 is a wasteful number, since it uses less digits than its factorization.

51693540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861571 (or 861569 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 51693540 is about 7189.8219727612. The cubic root of 51693540 is about 372.5164234610.

The spelling of 51693540 in words is "fifty-one million, six hundred ninety-three thousand, five hundred forty".