53445550 has 72 divisors (see below), whose sum is σ = 108868032. Its totient is φ = 19488000.

The previous prime is 53445547. The next prime is 53445589. The reversal of 53445550 is 5554435.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1303530 + ... + 1303570.

It is an arithmetic number, because the mean of its divisors is an integer number (1512056).

Almost surely, 2^53445550 is an apocalyptic number.

53445550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

53445550 is an abundant number, since it is smaller than the sum of its proper divisors (55422482).

53445550 is a wasteful number, since it uses less digits than its factorization.

53445550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 31.

The square root of 53445550 is about 7310.6463462542. The cubic root of 53445550 is about 376.6782264271.

Adding to 53445550 its reverse (5554435), we get a palindrome (58999985).

The spelling of 53445550 in words is "fifty-three million, four hundred forty-five thousand, five hundred fifty".