51503780 has 24 divisors (see below), whose sum is σ = 108953208. Its totient is φ = 20450048.

The previous prime is 51503773. The next prime is 51503789. The reversal of 51503780 is 8730515.

It can be written as a sum of positive squares in 4 ways, for example, as 13853284 + 37650496 = 3722^2 + 6136^2 .

It is not an unprimeable number, because it can be changed into a prime (51503789) 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, 6659 + ... + 12138.

It is an arithmetic number, because the mean of its divisors is an integer number (4539717).

Almost surely, 2^51503780 is an apocalyptic number.

It is an amenable number.

51503780 is an abundant number, since it is smaller than the sum of its proper divisors (57449428).

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

51503780 is a wasteful number, since it uses less digits than its factorization.

51503780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18943 (or 18941 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 51503780 is about 7176.6134074506. The cubic root of 51503780 is about 372.0600454197.

The spelling of 51503780 in words is "fifty-one million, five hundred three thousand, seven hundred eighty".