51440328 has 48 divisors (see below), whose sum is σ = 145379520. Its totient is φ = 16400736.

The previous prime is 51440327. The next prime is 51440359. The reversal of 51440328 is 82304415.

It is a super-2 number, since 2×51440328² = 5292214689495168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51440327) 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 11 ways as a sum of consecutive naturals, for example, 13876 + ... + 17187.

It is an arithmetic number, because the mean of its divisors is an integer number (3028740).

Almost surely, 2^51440328 is an apocalyptic number.

It is an amenable number.

51440328 is an abundant number, since it is smaller than the sum of its proper divisors (93939192).

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

51440328 is a wasteful number, since it uses less digits than its factorization.

51440328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31098 (or 31091 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 51440328 is about 7172.1912969468. The cubic root of 51440328 is about 371.9071915545.

The spelling of 51440328 in words is "fifty-one million, four hundred forty thousand, three hundred twenty-eight".