51218708 has 12 divisors (see below), whose sum is σ = 89774580. Its totient is φ = 25568832.

The previous prime is 51218663. The next prime is 51218743. The reversal of 51218708 is 80781215.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 36990724 + 14227984 = 6082^2 + 3772^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7193 + ... + 12416.

It is an arithmetic number, because the mean of its divisors is an integer number (7481215).

Almost surely, 2^51218708 is an apocalyptic number.

It is an amenable number.

51218708 is a deficient number, since it is larger than the sum of its proper divisors (38555872).

51218708 is a wasteful number, since it uses less digits than its factorization.

51218708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20266 (or 20264 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 51218708 is about 7156.7246698472. The cubic root of 51218708 is about 371.3723276629.

The spelling of 51218708 in words is "fifty-one million, two hundred eighteen thousand, seven hundred eight".