51440352 has 48 divisors (see below), whose sum is σ = 136950912. Its totient is φ = 16903040.

The previous prime is 51440327. The next prime is 51440359. The reversal of 51440352 is 25304415.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×51440352² = 5292219627767808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51440359) 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 7 ways as a sum of consecutive naturals, for example, 3043 + ... + 10589.

It is an arithmetic number, because the mean of its divisors is an integer number (2853144).

Almost surely, 2^51440352 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 51440352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68475456).

51440352 is an abundant number, since it is smaller than the sum of its proper divisors (85510560).

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

51440352 is a wasteful number, since it uses less digits than its factorization.

51440352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7631 (or 7623 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 51440352 is about 7172.1929700755. The cubic root of 51440352 is about 371.9072493935.

Adding to 51440352 its reverse (25304415), we get a palindrome (76744767).

The spelling of 51440352 in words is "fifty-one million, four hundred forty thousand, three hundred fifty-two".