51520722 has 64 divisors (see below), whose sum is σ = 116563968. Its totient is φ = 15048000.

The previous prime is 51520709. The next prime is 51520753. The reversal of 51520722 is 22702515.

It is a junction number, because it is equal to n+sod(n) for n = 51520692 and 51520701.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 269647 + ... + 269837.

It is an arithmetic number, because the mean of its divisors is an integer number (1821312).

Almost surely, 2^51520722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51520722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58281984).

51520722 is an abundant number, since it is smaller than the sum of its proper divisors (65043246).

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

51520722 is a wasteful number, since it uses less digits than its factorization.

51520722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 51520722 is about 7177.7936721530. The cubic root of 51520722 is about 372.1008369257.

The spelling of 51520722 in words is "fifty-one million, five hundred twenty thousand, seven hundred twenty-two".