51618004 has 6 divisors (see below), whose sum is σ = 90331514. Its totient is φ = 25809000.

The previous prime is 51617983. The next prime is 51618011. The reversal of 51618004 is 40081615.

It can be written as a sum of positive squares in only one way, i.e., 47610000 + 4008004 = 6900^2 + 2002^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51618004.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 6452247 + ... + 6452254.

Almost surely, 2^51618004 is an apocalyptic number.

It is an amenable number.

51618004 is a deficient number, since it is larger than the sum of its proper divisors (38713510).

51618004 is a wasteful number, since it uses less digits than its factorization.

51618004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12904505 (or 12904503 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 51618004 is about 7184.5670711602. The cubic root of 51618004 is about 372.3348913183.

Adding to 51618004 its reverse (40081615), we get a palindrome (91699619).

The spelling of 51618004 in words is "fifty-one million, six hundred eighteen thousand, four".