51357920 has 48 divisors (see below), whose sum is σ = 122018400. Its totient is φ = 20427264.

The previous prime is 51357899. The next prime is 51357937. The reversal of 51357920 is 2975315.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31034 + ... + 32646.

It is an arithmetic number, because the mean of its divisors is an integer number (2542050).

Almost surely, 2^51357920 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 51357920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61009200).

51357920 is an abundant number, since it is smaller than the sum of its proper divisors (70660480).

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

51357920 is a wasteful number, since it uses less digits than its factorization.

51357920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1827 (or 1819 counting only the distinct ones).

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 51357920 is about 7166.4440275495. Note that the first 3 decimals coincide. The cubic root of 51357920 is about 371.7084855338.

The spelling of 51357920 in words is "fifty-one million, three hundred fifty-seven thousand, nine hundred twenty".