51794640 has 100 divisors (see below), whose sum is σ = 179912964. Its totient is φ = 13810176.

The previous prime is 51794629. The next prime is 51794641. The reversal of 51794640 is 4649715.

51794640 is a `hidden beast` number, since 5 + 1 + 7 + 9 + 4 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10732176 + 41062464 = 3276^2 + 6408^2 .

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

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 51794595 and 51794604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51794641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2484 + ... + 10476.

Almost surely, 2^51794640 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 51794640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89956482).

51794640 is an abundant number, since it is smaller than the sum of its proper divisors (128118324).

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

51794640 is a wasteful number, since it uses less digits than its factorization.

51794640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8018 (or 8003 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 51794640 is about 7196.8493106359. The cubic root of 51794640 is about 372.7591158417.

The spelling of 51794640 in words is "fifty-one million, seven hundred ninety-four thousand, six hundred forty".