51885645 has 32 divisors (see below), whose sum is σ = 95738112. Its totient is φ = 23503872.

The previous prime is 51885643. The next prime is 51885653. The reversal of 51885645 is 54658815.

It is not a de Polignac number, because 51885645 - 2¹ = 51885643 is a prime.

It is a super-3 number, since 3×51885645³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51885597 and 51885606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51885643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9679 + ... + 14051.

It is an arithmetic number, because the mean of its divisors is an integer number (2991816).

Almost surely, 2^51885645 is an apocalyptic number.

It is an amenable number.

51885645 is a deficient number, since it is larger than the sum of its proper divisors (43852467).

51885645 is a wasteful number, since it uses less digits than its factorization.

51885645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4501.

The product of its digits is 192000, while the sum is 42.

The square root of 51885645 is about 7203.1690942251. The cubic root of 51885645 is about 372.9773050518.

The spelling of 51885645 in words is "fifty-one million, eight hundred eighty-five thousand, six hundred forty-five".