51662500 has 36 divisors (see below), whose sum is σ = 113031828. Its totient is φ = 20660000.

The previous prime is 51662497. The next prime is 51662519. The reversal of 51662500 is 526615.

It can be written as a sum of positive squares in 6 ways, for example, as 37283236 + 14379264 = 6106^2 + 3792^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10434 + ... + 14566.

It is an arithmetic number, because the mean of its divisors is an integer number (3139773).

Almost surely, 2^51662500 is an apocalyptic number.

51662500 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 51662500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56515914).

51662500 is an abundant number, since it is smaller than the sum of its proper divisors (61369328).

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

51662500 is an equidigital number, since it uses as much as digits as its factorization.

51662500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4162 (or 4140 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 51662500 is about 7187.6630416290. The cubic root of 51662500 is about 372.4418478956.

The spelling of 51662500 in words is "fifty-one million, six hundred sixty-two thousand, five hundred".