51172660 has 144 divisors (see below), whose sum is σ = 140652288. Its totient is φ = 15456000.

The previous prime is 51172621. The next prime is 51172663. The reversal of 51172660 is 6627115.

It is a super-2 number, since 2×51172660² = 5237282262951200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51172663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 506610 + ... + 506710.

It is an arithmetic number, because the mean of its divisors is an integer number (976752).

Almost surely, 2^51172660 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 51172660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70326144).

51172660 is an abundant number, since it is smaller than the sum of its proper divisors (89479628).

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

51172660 is a wasteful number, since it uses less digits than its factorization.

51172660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 51172660 is about 7153.5068323166. The cubic root of 51172660 is about 371.2610006301.

Adding to 51172660 its reverse (6627115), we get a palindrome (57799775).

It can be divided in two parts, 5117 and 2660, that added together give a palindrome (7777).

The spelling of 51172660 in words is "fifty-one million, one hundred seventy-two thousand, six hundred sixty".