52551720 has 256 divisors, whose sum is σ = 199584000. Its totient is φ = 12192768.

The previous prime is 52551703. The next prime is 52551749. The reversal of 52551720 is 2715525.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 266662 + ... + 266858.

It is an arithmetic number, because the mean of its divisors is an integer number (779625).

Almost surely, 2^52551720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 52551720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99792000).

52551720 is an abundant number, since it is smaller than the sum of its proper divisors (147032280).

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

52551720 is a wasteful number, since it uses less digits than its factorization.

52551720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 52551720 is about 7249.2565136019. The cubic root of 52551720 is about 374.5665391576.

The spelling of 52551720 in words is "fifty-two million, five hundred fifty-one thousand, seven hundred twenty".