51857309284 has 45 divisors (see below), whose sum is σ = 99930896905. Its totient is φ = 23546454800.

The previous prime is 51857309249. The next prime is 51857309321. The reversal of 51857309284 is 48290375815.

It is a happy number.

The square root of 51857309284 is 227722.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 32156379684 + 19700929600 = 179322^2 + 140360^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 55108254 + ... + 55109194.

Almost surely, 2^51857309284 is an apocalyptic number.

51857309284 is the 227722-nd square number.

It is an amenable number.

51857309284 is a deficient number, since it is larger than the sum of its proper divisors (48073587621).

51857309284 is an frugal number, since it uses more digits than its factorization.

51857309284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930 (or 954 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 51857309284 in words is "fifty-one billion, eight hundred fifty-seven million, three hundred nine thousand, two hundred eighty-four".