51660700 has 108 divisors (see below), whose sum is σ = 140610792. Its totient is φ = 16329600.

The previous prime is 51660683. The next prime is 51660701. The reversal of 51660700 is 706615.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51660701) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 63295 + ... + 64105.

Almost surely, 2^51660700 is an apocalyptic number.

51660700 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 51660700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70305396).

51660700 is an abundant number, since it is smaller than the sum of its proper divisors (88950092).

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

51660700 is a wasteful number, since it uses less digits than its factorization.

51660700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852 (or 838 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 51660700 is about 7187.5378259874. The cubic root of 51660700 is about 372.4375223654.

It can be divided in two parts, 516 and 60700, that added together give a palindrome (61216).

The spelling of 51660700 in words is "fifty-one million, six hundred sixty thousand, seven hundred".