51285656 has 32 divisors (see below), whose sum is σ = 99809280. Its totient is φ = 24679200.

The previous prime is 51285631. The next prime is 51285673. The reversal of 51285656 is 65658215.

It is a super-3 number, since 3×51285656³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55841 + ... + 56751.

It is an arithmetic number, because the mean of its divisors is an integer number (3119040).

Almost surely, 2^51285656 is an apocalyptic number.

It is an amenable number.

51285656 is a deficient number, since it is larger than the sum of its proper divisors (48523624).

51285656 is a wasteful number, since it uses less digits than its factorization.

51285656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175 (or 1171 counting only the distinct ones).

The product of its digits is 72000, while the sum is 38.

The square root of 51285656 is about 7161.4004217052. The cubic root of 51285656 is about 371.5340642026.

It can be divided in two parts, 512 and 85656, that added together give a palindrome (86168).

The spelling of 51285656 in words is "fifty-one million, two hundred eighty-five thousand, six hundred fifty-six".