1621073984 has 28 divisors (see below), whose sum is σ = 3237328044. Its totient is φ = 805369344.

The previous prime is 1621073983. The next prime is 1621074067. The reversal of 1621073984 is 4893701261.

It can be written as a sum of positive squares in 2 ways, for example, as 373571584 + 1247502400 = 19328^2 + 35320^2 .

It is not an unprimeable number, because it can be changed into a prime (1621073983) by changing a digit.

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, 70619 + ... + 90714.

Almost surely, 2^1621073984 is an apocalyptic number.

It is an amenable number.

1621073984 is a deficient number, since it is larger than the sum of its proper divisors (1616254060).

1621073984 is a wasteful number, since it uses less digits than its factorization.

1621073984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161502 (or 161492 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 1621073984 is about 40262.5630580071. The cubic root of 1621073984 is about 1174.7197723766.

The spelling of 1621073984 in words is "one billion, six hundred twenty-one million, seventy-three thousand, nine hundred eighty-four".