51656728 has 8 divisors (see below), whose sum is σ = 96856380. Its totient is φ = 25828360.

The previous prime is 51656719. The next prime is 51656729. The reversal of 51656728 is 82765615.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51656729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3228538 + ... + 3228553.

Almost surely, 2^51656728 is an apocalyptic number.

It is an amenable number.

51656728 is a deficient number, since it is larger than the sum of its proper divisors (45199652).

51656728 is a wasteful number, since it uses less digits than its factorization.

51656728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6457097 (or 6457093 counting only the distinct ones).

The product of its digits is 100800, while the sum is 40.

The square root of 51656728 is about 7187.2615090868. The cubic root of 51656728 is about 372.4279770066.

The spelling of 51656728 in words is "fifty-one million, six hundred fifty-six thousand, seven hundred twenty-eight".