51851904 has 192 divisors, whose sum is σ = 161274240. Its totient is φ = 14696448.

The previous prime is 51851869. The next prime is 51851927. The reversal of 51851904 is 40915815.

It is a tau number, because it is divible by the number of its divisors (192).

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1103209 + ... + 1103255.

It is an arithmetic number, because the mean of its divisors is an integer number (839970).

Almost surely, 2^51851904 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 51851904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80637120).

51851904 is an abundant number, since it is smaller than the sum of its proper divisors (109422336).

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

51851904 is a wasteful number, since it uses less digits than its factorization.

51851904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 51851904 is about 7200.8266192153. The cubic root of 51851904 is about 372.8964390361.

The spelling of 51851904 in words is "fifty-one million, eight hundred fifty-one thousand, nine hundred four".