1675643640 has 64 divisors (see below), whose sum is σ = 5483928960. Its totient is φ = 406216320.

The previous prime is 1675643639. The next prime is 1675643729. The reversal of 1675643640 is 463465761.

It is a junction number, because it is equal to n+sod(n) for n = 1675643592 and 1675643601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 633394 + ... + 636033.

It is an arithmetic number, because the mean of its divisors is an integer number (85686390).

Almost surely, 2^1675643640 is an apocalyptic number.

1675643640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1675643640 is an abundant number, since it is smaller than the sum of its proper divisors (3808285320).

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

1675643640 is a wasteful number, since it uses less digits than its factorization.

1675643640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1269452 (or 1269448 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The square root of 1675643640 is about 40934.6264182293. The cubic root of 1675643640 is about 1187.7559668351.

The spelling of 1675643640 in words is "one billion, six hundred seventy-five million, six hundred forty-three thousand, six hundred forty".