51322920 has 128 divisors (see below), whose sum is σ = 171072000. Its totient is φ = 12212480.

The previous prime is 51322907. The next prime is 51322927. The reversal of 51322920 is 2922315.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (51322927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77551 + ... + 78209.

It is an arithmetic number, because the mean of its divisors is an integer number (1336500).

Almost surely, 2^51322920 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 51322920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85536000).

51322920 is an abundant number, since it is smaller than the sum of its proper divisors (119749080).

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

51322920 is a wasteful number, since it uses less digits than its factorization.

51322920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743 (or 739 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 51322920 is about 7164.0016750417. The cubic root of 51322920 is about 371.6240275867.

Subtracting from 51322920 its sum of digits (24), we obtain a square (51322896 = 7164²).

The spelling of 51322920 in words is "fifty-one million, three hundred twenty-two thousand, nine hundred twenty".