1645020836 has 24 divisors (see below), whose sum is σ = 3071822880. Its totient is φ = 768543552.

The previous prime is 1645020823. The next prime is 1645020847. The reversal of 1645020836 is 6380205461.

It is a junction number, because it is equal to n+sod(n) for n = 1645020796 and 1645020805.

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 7 ways as a sum of consecutive naturals, for example, 142706 + ... + 153801.

It is an arithmetic number, because the mean of its divisors is an integer number (127992620).

Almost surely, 2^1645020836 is an apocalyptic number.

It is an amenable number.

1645020836 is a deficient number, since it is larger than the sum of its proper divisors (1426802044).

1645020836 is a wasteful number, since it uses less digits than its factorization.

1645020836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296603 (or 296601 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1645020836 is about 40558.8564434452. The cubic root of 1645020836 is about 1180.4759250373.

The spelling of 1645020836 in words is "one billion, six hundred forty-five million, twenty thousand, eight hundred thirty-six".