51761140 has 24 divisors (see below), whose sum is σ = 109823112. Its totient is φ = 20490240.

The previous prime is 51761117. The next prime is 51761153. The reversal of 51761140 is 4116715.

51761140 = T₄₄₅ + T₄₄₆ + ... + T₇₃₅.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 438244 + 51322896 = 662^2 + 7164^2 .

It is a super-2 number, since 2×51761140² = 5358431228199200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11401 + ... + 15280.

It is an arithmetic number, because the mean of its divisors is an integer number (4575963).

Almost surely, 2^51761140 is an apocalyptic number.

It is an amenable number.

51761140 is an abundant number, since it is smaller than the sum of its proper divisors (58061972).

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

51761140 is a wasteful number, since it uses less digits than its factorization.

51761140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26787 (or 26785 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 51761140 is about 7194.5215268286. The cubic root of 51761140 is about 372.6787334985.

Adding to 51761140 its reverse (4116715), we get a palindrome (55877855).

The spelling of 51761140 in words is "fifty-one million, seven hundred sixty-one thousand, one hundred forty".