51771240 has 96 divisors (see below), whose sum is σ = 173721600. Its totient is φ = 13357440.

The previous prime is 51771227. The next prime is 51771253. The reversal of 51771240 is 4217715.

It is an interprime number because it is at equal distance from previous prime (51771227) and next prime (51771253).

It is a super-2 number, since 2×51771240² = 5360522582275200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8841 + ... + 13479.

It is an arithmetic number, because the mean of its divisors is an integer number (1809600).

Almost surely, 2^51771240 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 51771240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86860800).

51771240 is an abundant number, since it is smaller than the sum of its proper divisors (121950360).

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

51771240 is a wasteful number, since it uses less digits than its factorization.

51771240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4687 (or 4680 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 51771240 is about 7195.2234155723. The cubic root of 51771240 is about 372.7029718262.

Adding to 51771240 its reverse (4217715), we get a palindrome (55988955).

The spelling of 51771240 in words is "fifty-one million, seven hundred seventy-one thousand, two hundred forty".