51992740 has 48 divisors (see below), whose sum is σ = 116867520. Its totient is φ = 19370880.

The previous prime is 51992729. The next prime is 51992741. The reversal of 51992740 is 4729915.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 51992740.

It is not an unprimeable number, because it can be changed into a prime (51992741) 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 15 ways as a sum of consecutive naturals, for example, 22059 + ... + 24301.

It is an arithmetic number, because the mean of its divisors is an integer number (2434740).

Almost surely, 2^51992740 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 51992740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58433760).

51992740 is an abundant number, since it is smaller than the sum of its proper divisors (64874780).

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

51992740 is a wasteful number, since it uses less digits than its factorization.

51992740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332 (or 2330 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 51992740 is about 7210.5991429284. The cubic root of 51992740 is about 373.2337443406.

The spelling of 51992740 in words is "fifty-one million, nine hundred ninety-two thousand, seven hundred forty".