1621823648 has 48 divisors (see below), whose sum is σ = 3221467200. Its totient is φ = 803712000.

The previous prime is 1621823639. The next prime is 1621823657. The reversal of 1621823648 is 8463281261.

It is an interprime number because it is at equal distance from previous prime (1621823639) and next prime (1621823657).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2707253 + ... + 2707851.

It is an arithmetic number, because the mean of its divisors is an integer number (67113900).

Almost surely, 2^1621823648 is an apocalyptic number.

It is an amenable number.

1621823648 is a deficient number, since it is larger than the sum of its proper divisors (1599643552).

1621823648 is a wasteful number, since it uses less digits than its factorization.

1621823648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221 (or 1213 counting only the distinct ones).

The product of its digits is 110592, while the sum is 41.

The square root of 1621823648 is about 40271.8716724217. The cubic root of 1621823648 is about 1174.9008271210.

The spelling of 1621823648 in words is "one billion, six hundred twenty-one million, eight hundred twenty-three thousand, six hundred forty-eight".