51749172 has 96 divisors (see below), whose sum is σ = 142248960. Its totient is φ = 16236000.

The previous prime is 51749171. The next prime is 51749177. The reversal of 51749172 is 27194715.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51749171) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 206047 + ... + 206297.

It is an arithmetic number, because the mean of its divisors is an integer number (1481760).

Almost surely, 2^51749172 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 51749172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71124480).

51749172 is an abundant number, since it is smaller than the sum of its proper divisors (90499788).

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

51749172 is a wasteful number, since it uses less digits than its factorization.

51749172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370 (or 362 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 51749172 is about 7193.6897347606. The cubic root of 51749172 is about 372.6500081981.

The spelling of 51749172 in words is "fifty-one million, seven hundred forty-nine thousand, one hundred seventy-two".