51570720 has 144 divisors (see below), whose sum is σ = 179262720. Its totient is φ = 13496832.

The previous prime is 51570713. The next prime is 51570737. The reversal of 51570720 is 2707515.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×51570720² = 5319078322636800, which contains 22 as substring.

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, 84657 + ... + 85263.

It is an arithmetic number, because the mean of its divisors is an integer number (1244880).

Almost surely, 2^51570720 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 51570720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89631360).

51570720 is an abundant number, since it is smaller than the sum of its proper divisors (127692000).

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

51570720 is a wasteful number, since it uses less digits than its factorization.

51570720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 27.

The square root of 51570720 is about 7181.2756526957. The cubic root of 51570720 is about 372.2211657437.

The spelling of 51570720 in words is "fifty-one million, five hundred seventy thousand, seven hundred twenty".