51072740 has 12 divisors (see below), whose sum is σ = 107252796. Its totient is φ = 20429088.

The previous prime is 51072737. The next prime is 51072751. The reversal of 51072740 is 4727015.

51072740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6770404 + 44302336 = 2602^2 + 6656^2 .

It is a super-2 number, since 2×51072740² = 5216849542215200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1276799 + ... + 1276838.

It is an arithmetic number, because the mean of its divisors is an integer number (8937733).

Almost surely, 2^51072740 is an apocalyptic number.

It is an amenable number.

51072740 is an abundant number, since it is smaller than the sum of its proper divisors (56180056).

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

51072740 is a wasteful number, since it uses less digits than its factorization.

51072740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2553646 (or 2553644 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 51072740 is about 7146.5194325630. The cubic root of 51072740 is about 371.0192011335.

Adding to 51072740 its reverse (4727015), we get a palindrome (55799755).

The spelling of 51072740 in words is "fifty-one million, seventy-two thousand, seven hundred forty".