51881232 has 160 divisors (see below), whose sum is σ = 154990080. Its totient is φ = 14837760.

The previous prime is 51881231. The next prime is 51881233. The reversal of 51881232 is 23218815.

It is an interprime number because it is at equal distance from previous prime (51881231) and next prime (51881233).

It is a zygodrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 51881232.

It is not an unprimeable number, because it can be changed into a prime (51881231) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 850482 + ... + 850542.

It is an arithmetic number, because the mean of its divisors is an integer number (968688).

Almost surely, 2^51881232 is an apocalyptic number.

51881232 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51881232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77495040).

51881232 is an abundant number, since it is smaller than the sum of its proper divisors (103108848).

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

51881232 is a wasteful number, since it uses less digits than its factorization.

51881232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 155 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 51881232 is about 7202.8627642070. The cubic root of 51881232 is about 372.9667305437.

The spelling of 51881232 in words is "fifty-one million, eight hundred eighty-one thousand, two hundred thirty-two".