51637860 has 72 divisors (see below), whose sum is σ = 160478136. Its totient is φ = 13432320.

The previous prime is 51637849. The next prime is 51637871. The reversal of 51637860 is 6873615.

It is an interprime number because it is at equal distance from previous prime (51637849) and next prime (51637871).

It can be written as a sum of positive squares in 4 ways, for example, as 142884 + 51494976 = 378^2 + 7176^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3882 + ... + 10878.

It is an arithmetic number, because the mean of its divisors is an integer number (2228863).

Almost surely, 2^51637860 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51637860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80239068).

51637860 is an abundant number, since it is smaller than the sum of its proper divisors (108840276).

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

51637860 is a wasteful number, since it uses less digits than its factorization.

51637860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7053 (or 7048 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 51637860 is about 7185.9487891301. The cubic root of 51637860 is about 372.3826274650.

The spelling of 51637860 in words is "fifty-one million, six hundred thirty-seven thousand, eight hundred sixty".