51451780 has 12 divisors (see below), whose sum is σ = 108048780. Its totient is φ = 20580704.

The previous prime is 51451769. The next prime is 51451781. The reversal of 51451780 is 8715415.

It can be written as a sum of positive squares in 2 ways, for example, as 9253764 + 42198016 = 3042^2 + 6496^2 .

It is not an unprimeable number, because it can be changed into a prime (51451781) 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, 1286275 + ... + 1286314.

It is an arithmetic number, because the mean of its divisors is an integer number (9004065).

Almost surely, 2^51451780 is an apocalyptic number.

It is an amenable number.

51451780 is an abundant number, since it is smaller than the sum of its proper divisors (56597000).

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

51451780 is a wasteful number, since it uses less digits than its factorization.

51451780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572598 (or 2572596 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 51451780 is about 7172.9896138221. The cubic root of 51451780 is about 371.9347883532.

The spelling of 51451780 in words is "fifty-one million, four hundred fifty-one thousand, seven hundred eighty".