51720074 has 16 divisors (see below), whose sum is σ = 88938816. Its totient is φ = 22096800.

The previous prime is 51720073. The next prime is 51720089. The reversal of 51720074 is 47002715.

51720074 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (51720073) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 947 + ... + 10214.

It is an arithmetic number, because the mean of its divisors is an integer number (5558676).

Almost surely, 2^51720074 is an apocalyptic number.

51720074 is a deficient number, since it is larger than the sum of its proper divisors (37218742).

51720074 is a wasteful number, since it uses less digits than its factorization.

51720074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11501.

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

The square root of 51720074 is about 7191.6669833913. Note that the first 3 decimals coincide. The cubic root of 51720074 is about 372.5801494125.

Adding to 51720074 its reverse (47002715), we get a palindrome (98722789).

The spelling of 51720074 in words is "fifty-one million, seven hundred twenty thousand, seventy-four".