51318700 has 36 divisors (see below), whose sum is σ = 111980680. Its totient is φ = 20413440.

The previous prime is 51318653. The next prime is 51318703. The reversal of 51318700 is 781315.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (51318703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17971 + ... + 20629.

Almost surely, 2^51318700 is an apocalyptic number.

51318700 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 51318700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55990340).

51318700 is an abundant number, since it is smaller than the sum of its proper divisors (60661980).

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

51318700 is a wasteful number, since it uses less digits than its factorization.

51318700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866 (or 2859 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 51318700 is about 7163.7071408594. The cubic root of 51318700 is about 371.6138417777.

It can be divided in two parts, 5131 and 8700, that added together give a palindrome (13831).

The spelling of 51318700 in words is "fifty-one million, three hundred eighteen thousand, seven hundred".