512381640 has 64 divisors (see below), whose sum is σ = 1586741760. Its totient is φ = 132226560.

The previous prime is 512381563. The next prime is 512381651. The reversal of 512381640 is 46183215.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 512381598 and 512381607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65149 + ... + 72588.

It is an arithmetic number, because the mean of its divisors is an integer number (24792840).

Almost surely, 2^512381640 is an apocalyptic number.

It is an amenable number.

512381640 is an abundant number, since it is smaller than the sum of its proper divisors (1074360120).

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

512381640 is a wasteful number, since it uses less digits than its factorization.

512381640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137782 (or 137778 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 512381640 is about 22635.8485593096. The cubic root of 512381640 is about 800.1987214665.

The spelling of 512381640 in words is "five hundred twelve million, three hundred eighty-one thousand, six hundred forty".