1640503820 has 12 divisors (see below), whose sum is σ = 3445058064. Its totient is φ = 656201520.

The previous prime is 1640503811. The next prime is 1640503841. The reversal of 1640503820 is 283050461.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 41012576 + ... + 41012615.

It is an arithmetic number, because the mean of its divisors is an integer number (287088172).

Almost surely, 2^1640503820 is an apocalyptic number.

1640503820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640503820 is an abundant number, since it is smaller than the sum of its proper divisors (1804554244).

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

1640503820 is a wasteful number, since it uses less digits than its factorization.

1640503820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82025200 (or 82025198 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1640503820 is about 40503.1334590301. The cubic root of 1640503820 is about 1179.3944561340.

The spelling of 1640503820 in words is "one billion, six hundred forty million, five hundred three thousand, eight hundred twenty".