51773940 has 72 divisors (see below), whose sum is σ = 157667328. Its totient is φ = 13752000.

The previous prime is 51773929. The next prime is 51773947. The reversal of 51773940 is 4937715.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 51773895 and 51773904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51773947) 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 23 ways as a sum of consecutive naturals, for example, 68565 + ... + 69315.

It is an arithmetic number, because the mean of its divisors is an integer number (2189824).

Almost surely, 2^51773940 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 51773940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78833664).

51773940 is an abundant number, since it is smaller than the sum of its proper divisors (105893388).

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

51773940 is a wasteful number, since it uses less digits than its factorization.

51773940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149 (or 1144 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 51773940 is about 7195.4110375989. The cubic root of 51773940 is about 372.7094508451.

The spelling of 51773940 in words is "fifty-one million, seven hundred seventy-three thousand, nine hundred forty".