51018864 has 40 divisors (see below), whose sum is σ = 141938832. Its totient is φ = 15697920.

The previous prime is 51018841. The next prime is 51018871. The reversal of 51018864 is 46881015.

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, 40257 + ... + 41504.

Almost surely, 2^51018864 is an apocalyptic number.

It is an amenable number.

51018864 is an abundant number, since it is smaller than the sum of its proper divisors (90919968).

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

51018864 is a wasteful number, since it uses less digits than its factorization.

51018864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81785 (or 81779 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 51018864 is about 7142.7490506107. The cubic root of 51018864 is about 370.8886940481. Note that the first 3 decimals are identical.

Adding to 51018864 its reverse (46881015), we get a palindrome (97899879).

The spelling of 51018864 in words is "fifty-one million, eighteen thousand, eight hundred sixty-four".