1645634676 has 48 divisors (see below), whose sum is σ = 4400023040. Its totient is φ = 468931680.

The previous prime is 1645634621. The next prime is 1645634699. The reversal of 1645634676 is 6764365461.

It is a super-2 number, since 2×1645634676² = 5416226973707249952, which contains 22 as substring.

It is a congruent number.

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, 5991 + ... + 57681.

Almost surely, 2^1645634676 is an apocalyptic number.

It is an amenable number.

1645634676 is an abundant number, since it is smaller than the sum of its proper divisors (2754388364).

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

1645634676 is a wasteful number, since it uses less digits than its factorization.

1645634676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52084 (or 52082 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 48.

The square root of 1645634676 is about 40566.4230121415. The cubic root of 1645634676 is about 1180.6227384218.

The spelling of 1645634676 in words is "one billion, six hundred forty-five million, six hundred thirty-four thousand, six hundred seventy-six".