51209864 has 32 divisors (see below), whose sum is σ = 101640000. Its totient is φ = 24121152.

The previous prime is 51209863. The next prime is 51209867. The reversal of 51209864 is 46890215.

It is not an unprimeable number, because it can be changed into a prime (51209863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29402 + ... + 31094.

It is an arithmetic number, because the mean of its divisors is an integer number (3176250).

Almost surely, 2^51209864 is an apocalyptic number.

It is an amenable number.

51209864 is a deficient number, since it is larger than the sum of its proper divisors (50430136).

51209864 is a wasteful number, since it uses less digits than its factorization.

51209864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917 (or 1913 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 51209864 is about 7156.1067627586. The cubic root of 51209864 is about 371.3509513204.

The spelling of 51209864 in words is "fifty-one million, two hundred nine thousand, eight hundred sixty-four".