51983604 has 18 divisors (see below), whose sum is σ = 131403090. Its totient is φ = 17327856.

The previous prime is 51983579. The next prime is 51983609. The reversal of 51983604 is 40638915.

51983604 is a `hidden beast` number, since 519 + 83 + 60 + 4 = 666.

51983604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 50979600 + 1004004 = 7140^2 + 1002^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1443989 = 51983604 / (5 + 1 + 9 + 8 + 3 + 6 + 0 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51983609) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 721959 + ... + 722030.

Almost surely, 2^51983604 is an apocalyptic number.

It is an amenable number.

51983604 is an abundant number, since it is smaller than the sum of its proper divisors (79419486).

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

51983604 is a wasteful number, since it uses less digits than its factorization.

51983604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443999 (or 1443994 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 51983604 is about 7209.9656032467. The cubic root of 51983604 is about 373.2118819086.

The spelling of 51983604 in words is "fifty-one million, nine hundred eighty-three thousand, six hundred four".