51555330 has 48 divisors (see below), whose sum is σ = 138673080. Its totient is φ = 13273344.

The previous prime is 51555307. The next prime is 51555347. The reversal of 51555330 is 3355515.

It can be written as a sum of positive squares in 4 ways, for example, as 36832761 + 14722569 = 6069^2 + 3837^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51555294 and 51555303.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7267 + ... + 12486.

Almost surely, 2^51555330 is an apocalyptic number.

51555330 is an abundant number, since it is smaller than the sum of its proper divisors (87117750).

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

51555330 is a wasteful number, since it uses less digits than its factorization.

51555330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19795 (or 19792 counting only the distinct ones).

The product of its (nonzero) digits is 5625, while the sum is 27.

The square root of 51555330 is about 7180.2040360981. The cubic root of 51555330 is about 372.1841353404.

The spelling of 51555330 in words is "fifty-one million, five hundred fifty-five thousand, three hundred thirty".