51445340 has 12 divisors (see below), whose sum is σ = 108035256. Its totient is φ = 20578128.

The previous prime is 51445327. The next prime is 51445343. The reversal of 51445340 is 4354415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51445343) 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, 1286114 + ... + 1286153.

It is an arithmetic number, because the mean of its divisors is an integer number (9002938).

Almost surely, 2^51445340 is an apocalyptic number.

It is an amenable number.

51445340 is an abundant number, since it is smaller than the sum of its proper divisors (56589916).

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

51445340 is a wasteful number, since it uses less digits than its factorization.

51445340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572276 (or 2572274 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 51445340 is about 7172.5406935060. The cubic root of 51445340 is about 371.9192698750.

Adding to 51445340 its reverse (4354415), we get a palindrome (55799755).

It can be divided in two parts, 514 and 45340, that added together give a palindrome (45854).

The spelling of 51445340 in words is "fifty-one million, four hundred forty-five thousand, three hundred forty".