51133740 has 96 divisors (see below), whose sum is σ = 164688384. Its totient is φ = 11612160.

The previous prime is 51133721. The next prime is 51133763. The reversal of 51133740 is 4733115.

It is a super-2 number, since 2×51133740² = 5229318732775200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51133740.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88332 + ... + 88908.

It is an arithmetic number, because the mean of its divisors is an integer number (1715504).

Almost surely, 2^51133740 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 51133740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82344192).

51133740 is an abundant number, since it is smaller than the sum of its proper divisors (113554644).

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

51133740 is a wasteful number, since it uses less digits than its factorization.

51133740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 805 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 51133740 is about 7150.7859707867. The cubic root of 51133740 is about 371.1668543748.

Adding to 51133740 its reverse (4733115), we get a palindrome (55866855).

The spelling of 51133740 in words is "fifty-one million, one hundred thirty-three thousand, seven hundred forty".