51620550 has 96 divisors (see below), whose sum is σ = 134348544. Its totient is φ = 13104000.

The previous prime is 51620531. The next prime is 51620567. The reversal of 51620550 is 5502615.

51620550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51620550.

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 47 ways as a sum of consecutive naturals, for example, 393985 + ... + 394115.

It is an arithmetic number, because the mean of its divisors is an integer number (1399464).

Almost surely, 2^51620550 is an apocalyptic number.

51620550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51620550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67174272).

51620550 is an abundant number, since it is smaller than the sum of its proper divisors (82727994).

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

51620550 is a wasteful number, since it uses less digits than its factorization.

51620550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 51620550 is about 7184.7442543211. The cubic root of 51620550 is about 372.3410128843.

The spelling of 51620550 in words is "fifty-one million, six hundred twenty thousand, five hundred fifty".