51618020 has 12 divisors (see below), whose sum is σ = 108397884. Its totient is φ = 20647200.

The previous prime is 51618019. The next prime is 51618023. The reversal of 51618020 is 2081615.

It can be written as a sum of positive squares in 2 ways, for example, as 26956864 + 24661156 = 5192^2 + 4966^2 .

It is not an unprimeable number, because it can be changed into a prime (51618023) 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 3 ways as a sum of consecutive naturals, for example, 1290431 + ... + 1290470.

It is an arithmetic number, because the mean of its divisors is an integer number (9033157).

Almost surely, 2^51618020 is an apocalyptic number.

It is an amenable number.

51618020 is an abundant number, since it is smaller than the sum of its proper divisors (56779864).

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

51618020 is a wasteful number, since it uses less digits than its factorization.

51618020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2580910 (or 2580908 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 51618020 is about 7184.5681846580. The cubic root of 51618020 is about 372.3349297891.

Adding to 51618020 its reverse (2081615), we get a palindrome (53699635).

The spelling of 51618020 in words is "fifty-one million, six hundred eighteen thousand, twenty".