51569952 has 144 divisors (see below), whose sum is σ = 166047840. Its totient is φ = 13934592.

The previous prime is 51569941. The next prime is 51569983. The reversal of 51569952 is 25996515.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89088 + ... + 89664.

It is an arithmetic number, because the mean of its divisors is an integer number (1153110).

Almost surely, 2^51569952 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 51569952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83023920).

51569952 is an abundant number, since it is smaller than the sum of its proper divisors (114477888).

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

51569952 is a wasteful number, since it uses less digits than its factorization.

51569952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 608 counting only the distinct ones).

The product of its digits is 121500, while the sum is 42.

The square root of 51569952 is about 7181.2221801028. Note that the first 3 decimals coincide. The cubic root of 51569952 is about 372.2193180074.

The spelling of 51569952 in words is "fifty-one million, five hundred sixty-nine thousand, nine hundred fifty-two".