51487744 has 88 divisors (see below), whose sum is σ = 128518848. Its totient is φ = 20029440.

The previous prime is 51487717. The next prime is 51487753. The reversal of 51487744 is 44778415.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (88).

It is a junction number, because it is equal to n+sod(n) for n = 51487697 and 51487706.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78522 + ... + 79174.

Almost surely, 2^51487744 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 51487744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64259424).

51487744 is an abundant number, since it is smaller than the sum of its proper divisors (77031104).

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

51487744 is a wasteful number, since it uses less digits than its factorization.

51487744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691 (or 673 counting only the distinct ones).

The product of its digits is 125440, while the sum is 40.

The square root of 51487744 is about 7175.4960804114. The cubic root of 51487744 is about 372.0214270619.

The spelling of 51487744 in words is "fifty-one million, four hundred eighty-seven thousand, seven hundred forty-four".