51611800 has 48 divisors (see below), whose sum is σ = 120862800. Its totient is φ = 20496000.

The previous prime is 51611797. The next prime is 51611821. The reversal of 51611800 is 811615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29346 + ... + 31054.

It is an arithmetic number, because the mean of its divisors is an integer number (2517975).

Almost surely, 2^51611800 is an apocalyptic number.

51611800 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51611800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60431400).

51611800 is an abundant number, since it is smaller than the sum of its proper divisors (69251000).

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

51611800 is a wasteful number, since it uses less digits than its factorization.

51611800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876 (or 1867 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 51611800 is about 7184.1352993941. The cubic root of 51611800 is about 372.3199736666.

The spelling of 51611800 in words is "fifty-one million, six hundred eleven thousand, eight hundred".