52297728 has 144 divisors (see below), whose sum is σ = 167771520. Its totient is φ = 14155776.

The previous prime is 52297717. The next prime is 52297733. The reversal of 52297728 is 82779225.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

Its product of digits (141120) is a multiple of the sum of its prime factors (63).

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 52297728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2752503 + ... + 2752521.

It is an arithmetic number, because the mean of its divisors is an integer number (1165080).

Almost surely, 2^52297728 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 52297728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83885760).

52297728 is an abundant number, since it is smaller than the sum of its proper divisors (115473792).

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

52297728 is an frugal number, since it uses more digits than its factorization.

52297728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63 (or 31 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The square root of 52297728 is about 7231.7168086147. The cubic root of 52297728 is about 373.9621149916.

The spelling of 52297728 in words is "fifty-two million, two hundred ninety-seven thousand, seven hundred twenty-eight".