51552330 has 64 divisors (see below), whose sum is σ = 131839488. Its totient is φ = 12856320.

The previous prime is 51552329. The next prime is 51552331. The reversal of 51552330 is 3325515.

It is an interprime number because it is at equal distance from previous prime (51552329) and next prime (51552331).

It is a self number, because there is not a number n which added to its sum of digits gives 51552330.

It is not an unprimeable number, because it can be changed into a prime (51552331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138024 + ... + 138396.

It is an arithmetic number, because the mean of its divisors is an integer number (2059992).

Almost surely, 2^51552330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51552330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65919744).

51552330 is an abundant number, since it is smaller than the sum of its proper divisors (80287158).

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

51552330 is a wasteful number, since it uses less digits than its factorization.

51552330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671.

The product of its (nonzero) digits is 2250, while the sum is 24.

The square root of 51552330 is about 7179.9951253465. The cubic root of 51552330 is about 372.1769160800.

Adding to 51552330 its reverse (3325515), we get a palindrome (54877845).

The spelling of 51552330 in words is "fifty-one million, five hundred fifty-two thousand, three hundred thirty".