511228428520 has 16 divisors (see below), whose sum is σ = 1150263964260. Its totient is φ = 204491371392.

The previous prime is 511228428497. The next prime is 511228428523. The reversal of 511228428520 is 25824822115.

It can be written as a sum of positive squares in 2 ways, for example, as 511227860004 + 568516 = 715002^2 + 754^2 .

It is a super-2 number, since 2×511228428520² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 12780710713 = 511228428520 / (5 + 1 + 1 + 2 + 2 + 8 + 4 + 2 + 8 + 5 + 2 + 0).

It is not an unprimeable number, because it can be changed into a prime (511228428523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6390355317 + ... + 6390355396.

Almost surely, 2^511228428520 is an apocalyptic number.

It is an amenable number.

511228428520 is an abundant number, since it is smaller than the sum of its proper divisors (639035535740).

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

511228428520 is a wasteful number, since it uses less digits than its factorization.

511228428520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12780710724 (or 12780710720 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 40.

The spelling of 511228428520 in words is "five hundred eleven billion, two hundred twenty-eight million, four hundred twenty-eight thousand, five hundred twenty".