51855552 has 140 divisors (see below), whose sum is σ = 175798480. Its totient is φ = 14805504.

The previous prime is 51855533. The next prime is 51855553. The reversal of 51855552 is 25555815.

51855552 is a `hidden beast` number, since 51 + 8 + 55 + 552 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (51855553) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 35574 + ... + 37002.

Almost surely, 2^51855552 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 51855552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87899240).

51855552 is an abundant number, since it is smaller than the sum of its proper divisors (123942928).

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

51855552 is a wasteful number, since it uses less digits than its factorization.

51855552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460 (or 1441 counting only the distinct ones).

The product of its digits is 50000, while the sum is 36.

The square root of 51855552 is about 7201.0799190121. The cubic root of 51855552 is about 372.9051837765.

The spelling of 51855552 in words is "fifty-one million, eight hundred fifty-five thousand, five hundred fifty-two".