51440320 has 28 divisors (see below), whose sum is σ = 122493024. Its totient is φ = 20576000.

The previous prime is 51440303. The next prime is 51440327. The reversal of 51440320 is 2304415.

It is a super-2 number, since 2×51440320² = 5292213043404800, 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80056 + ... + 80695.

Almost surely, 2^51440320 is an apocalyptic number.

It is an amenable number.

51440320 is an abundant number, since it is smaller than the sum of its proper divisors (71052704).

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

51440320 is a wasteful number, since it uses less digits than its factorization.

51440320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160768 (or 160758 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 51440320 is about 7172.1907392372. The cubic root of 51440320 is about 371.9071722748.

Adding to 51440320 its reverse (2304415), we get a palindrome (53744735).

The spelling of 51440320 in words is "fifty-one million, four hundred forty thousand, three hundred twenty".