53213550 has 96 divisors (see below), whose sum is σ = 147178080. Its totient is φ = 12633600.

The previous prime is 53213543. The next prime is 53213551. The reversal of 53213550 is 5531235.

It is a self number, because there is not a number n which added to its sum of digits gives 53213550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53213551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 56080 + ... + 57020.

It is an arithmetic number, because the mean of its divisors is an integer number (1533105).

Almost surely, 2^53213550 is an apocalyptic number.

53213550 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 53213550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73589040).

53213550 is an abundant number, since it is smaller than the sum of its proper divisors (93964530).

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

53213550 is a wasteful number, since it uses less digits than its factorization.

53213550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998 (or 993 counting only the distinct ones).

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

The square root of 53213550 is about 7294.7618192783. The cubic root of 53213550 is about 376.1323992388.

Adding to 53213550 its reverse (5531235), we get a palindrome (58744785).

The spelling of 53213550 in words is "fifty-three million, two hundred thirteen thousand, five hundred fifty".