51894720 has 168 divisors, whose sum is σ = 183696864. Its totient is φ = 13436928.

The previous prime is 51894707. The next prime is 51894737. The reversal of 51894720 is 2749815.

51894720 is a `hidden beast` number, since 5 + 189 + 472 + 0 = 666.

51894720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106317 + ... + 106803.

Almost surely, 2^51894720 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 51894720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91848432).

51894720 is an abundant number, since it is smaller than the sum of its proper divisors (131802144).

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

51894720 is a wasteful number, since it uses less digits than its factorization.

51894720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547 (or 534 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 51894720 is about 7203.7989977511. The cubic root of 51894720 is about 372.9990488419. Note that the first 3 decimals are identical.

The spelling of 51894720 in words is "fifty-one million, eight hundred ninety-four thousand, seven hundred twenty".