51603804 has 120 divisors (see below), whose sum is σ = 157121888. Its totient is φ = 14463360.

The previous prime is 51603803. The next prime is 51603817. The reversal of 51603804 is 40830615.

51603804 is a `hidden beast` number, since 51 + 603 + 8 + 0 + 4 = 666.

51603804 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 (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51603803) 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 39 ways as a sum of consecutive naturals, for example, 138162 + ... + 138534.

Almost surely, 2^51603804 is an apocalyptic number.

51603804 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51603804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78560944).

51603804 is an abundant number, since it is smaller than the sum of its proper divisors (105518084).

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

51603804 is a wasteful number, since it uses less digits than its factorization.

51603804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 51603804 is about 7183.5787738425. The cubic root of 51603804 is about 372.3007453489.

The spelling of 51603804 in words is "fifty-one million, six hundred three thousand, eight hundred four".