53512720 has 80 divisors (see below), whose sum is σ = 131420160. Its totient is φ = 20224512.

The previous prime is 53512717. The next prime is 53512747. The reversal of 53512720 is 2721535.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×53512720² = 5727222403596800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233566 + ... + 233794.

It is an arithmetic number, because the mean of its divisors is an integer number (1642752).

Almost surely, 2^53512720 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 53512720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65710080).

53512720 is an abundant number, since it is smaller than the sum of its proper divisors (77907440).

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

53512720 is a wasteful number, since it uses less digits than its factorization.

53512720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 53512720 is about 7315.2388887855. The cubic root of 53512720 is about 376.8359625672.

The spelling of 53512720 in words is "fifty-three million, five hundred twelve thousand, seven hundred twenty".