51552990 has 64 divisors (see below), whose sum is σ = 140857920. Its totient is φ = 13409280.

The previous prime is 51552953. The next prime is 51553009. The reversal of 51552990 is 9925515.

51552990 is a `hidden beast` number, since 515 + 52 + 9 + 90 = 666.

51552990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8742 + ... + 13398.

It is an arithmetic number, because the mean of its divisors is an integer number (2200905).

Almost surely, 2^51552990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51552990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70428960).

51552990 is an abundant number, since it is smaller than the sum of its proper divisors (89304930).

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

51552990 is a wasteful number, since it uses less digits than its factorization.

51552990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4714 (or 4708 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 36.

The square root of 51552990 is about 7180.0410862334. The cubic root of 51552990 is about 372.1785043413.

The spelling of 51552990 in words is "fifty-one million, five hundred fifty-two thousand, nine hundred ninety".