51687572 has 6 divisors (see below), whose sum is σ = 90453258. Its totient is φ = 25843784.

The previous prime is 51687553. The next prime is 51687607. The reversal of 51687572 is 27578615.

It can be written as a sum of positive squares in only one way, i.e., 27520516 + 24167056 = 5246^2 + 4916^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6460943 + ... + 6460950.

It is an arithmetic number, because the mean of its divisors is an integer number (15075543).

Almost surely, 2^51687572 is an apocalyptic number.

It is an amenable number.

51687572 is a deficient number, since it is larger than the sum of its proper divisors (38765686).

51687572 is a wasteful number, since it uses less digits than its factorization.

51687572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12921897 (or 12921895 counting only the distinct ones).

The product of its digits is 117600, while the sum is 41.

The square root of 51687572 is about 7189.4069296431. The cubic root of 51687572 is about 372.5020872817.

It can be divided in two parts, 516 and 87572, that added together give a palindrome (88088).

The spelling of 51687572 in words is "fifty-one million, six hundred eighty-seven thousand, five hundred seventy-two".