1620441656 has 16 divisors (see below), whose sum is σ = 3039600600. Its totient is φ = 809881504.

The previous prime is 1620441653. The next prime is 1620441689. The reversal of 1620441656 is 6561440261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620441653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21515 + ... + 60858.

Almost surely, 2^1620441656 is an apocalyptic number.

It is an amenable number.

1620441656 is a deficient number, since it is larger than the sum of its proper divisors (1419158944).

1620441656 is a wasteful number, since it uses less digits than its factorization.

1620441656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84838 (or 84834 counting only the distinct ones).

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

The square root of 1620441656 is about 40254.7097368743. The cubic root of 1620441656 is about 1174.5670125778.

The spelling of 1620441656 in words is "one billion, six hundred twenty million, four hundred forty-one thousand, six hundred fifty-six".