1621648676 has 6 divisors (see below), whose sum is σ = 2837885190. Its totient is φ = 810824336.

The previous prime is 1621648667. The next prime is 1621648681. The reversal of 1621648676 is 6768461261.

It can be written as a sum of positive squares in only one way, i.e., 1487644900 + 134003776 = 38570^2 + 11576^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1621648676.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 202706081 + ... + 202706088.

It is an arithmetic number, because the mean of its divisors is an integer number (472980865).

Almost surely, 2^1621648676 is an apocalyptic number.

It is an amenable number.

1621648676 is a deficient number, since it is larger than the sum of its proper divisors (1216236514).

1621648676 is a wasteful number, since it uses less digits than its factorization.

1621648676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405412173 (or 405412171 counting only the distinct ones).

The product of its digits is 580608, while the sum is 47.

The square root of 1621648676 is about 40269.6992290730. The cubic root of 1621648676 is about 1174.8585738338.

The spelling of 1621648676 in words is "one billion, six hundred twenty-one million, six hundred forty-eight thousand, six hundred seventy-six".