51231488 has 144 divisors (see below), whose sum is σ = 134217216. Its totient is φ = 18923520.

The previous prime is 51231463. The next prime is 51231491. The reversal of 51231488 is 88413215.

It is a Harshad number since it is a multiple of its sum of digits (32).

51231488 is a modest number, since divided by 31488 gives 512 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 453320 + ... + 453432.

It is an arithmetic number, because the mean of its divisors is an integer number (932064).

Almost surely, 2^51231488 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 51231488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67108608).

51231488 is an abundant number, since it is smaller than the sum of its proper divisors (82985728).

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

51231488 is a wasteful number, since it uses less digits than its factorization.

51231488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 156 counting only the distinct ones).

The product of its digits is 7680, while the sum is 32.

The square root of 51231488 is about 7157.6174806984. The cubic root of 51231488 is about 371.4032131462.

The spelling of 51231488 in words is "fifty-one million, two hundred thirty-one thousand, four hundred eighty-eight".