51806448 has 30 divisors (see below), whose sum is σ = 144986504. Its totient is φ = 17268768.

The previous prime is 51806437. The next prime is 51806449. The reversal of 51806448 is 84460815.

51806448 is a `hidden beast` number, since 5 + 1 + 8 + 0 + 644 + 8 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51806449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 179740 + ... + 180027.

Almost surely, 2^51806448 is an apocalyptic number.

It is an amenable number.

51806448 is an abundant number, since it is smaller than the sum of its proper divisors (93180056).

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

51806448 is a wasteful number, since it uses less digits than its factorization.

51806448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359781 (or 359772 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 51806448 is about 7197.6696228710. The cubic root of 51806448 is about 372.7874405563.

It can be divided in two parts, 5180 and 6448, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 51806448 in words is "fifty-one million, eight hundred six thousand, four hundred forty-eight".