51618208 has 12 divisors (see below), whose sum is σ = 101623410. Its totient is φ = 25809088.

The previous prime is 51618181. The next prime is 51618209. The reversal of 51618208 is 80281615.

It can be written as a sum of positive squares in only one way, i.e., 26337424 + 25280784 = 5132^2 + 5028^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51618208.

It is not an unprimeable number, because it can be changed into a prime (51618209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 806503 + ... + 806566.

Almost surely, 2^51618208 is an apocalyptic number.

It is an amenable number.

51618208 is a deficient number, since it is larger than the sum of its proper divisors (50005202).

51618208 is a wasteful number, since it uses less digits than its factorization.

51618208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613079 (or 1613071 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 51618208 is about 7184.5812682438. The cubic root of 51618208 is about 372.3353818204.

The spelling of 51618208 in words is "fifty-one million, six hundred eighteen thousand, two hundred eight".