51512448 has 128 divisors (see below), whose sum is σ = 156280320. Its totient is φ = 14893056.

The previous prime is 51512443. The next prime is 51512453. The reversal of 51512448 is 84421515.

It is an interprime number because it is at equal distance from previous prime (51512443) and next prime (51512453).

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51512443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84561 + ... + 85167.

It is an arithmetic number, because the mean of its divisors is an integer number (1220940).

Almost surely, 2^51512448 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 51512448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78140160).

51512448 is an abundant number, since it is smaller than the sum of its proper divisors (104767872).

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

51512448 is a wasteful number, since it uses less digits than its factorization.

51512448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654 (or 642 counting only the distinct ones).

The product of its digits is 6400, while the sum is 30.

The square root of 51512448 is about 7177.2172880581. The cubic root of 51512448 is about 372.0809166100.

The spelling of 51512448 in words is "fifty-one million, five hundred twelve thousand, four hundred forty-eight".