51775440 has 160 divisors (see below), whose sum is σ = 170881920. Its totient is φ = 12945408.

The previous prime is 51775439. The next prime is 51775453. The reversal of 51775440 is 4457715.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 299194 + ... + 299366.

It is an arithmetic number, because the mean of its divisors is an integer number (1068012).

Almost surely, 2^51775440 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 51775440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85440960).

51775440 is an abundant number, since it is smaller than the sum of its proper divisors (119106480).

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

51775440 is a wasteful number, since it uses less digits than its factorization.

51775440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 33.

The square root of 51775440 is about 7195.5152699442. The cubic root of 51775440 is about 372.7130502027.

It can be divided in two parts, 517 and 75440, that added together give a palindrome (75957).

The spelling of 51775440 in words is "fifty-one million, seven hundred seventy-five thousand, four hundred forty".