1621699768 has 32 divisors (see below), whose sum is σ = 3467212560. Its totient is φ = 704448000.

The previous prime is 1621699763. The next prime is 1621699769. The reversal of 1621699768 is 8679961261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621699763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456858 + ... + 460393.

Almost surely, 2^1621699768 is an apocalyptic number.

It is an amenable number.

1621699768 is an abundant number, since it is smaller than the sum of its proper divisors (1845512792).

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

1621699768 is a wasteful number, since it uses less digits than its factorization.

1621699768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917287 (or 917283 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 55.

The square root of 1621699768 is about 40270.3335968303. Note that the first 3 decimals coincide. The cubic root of 1621699768 is about 1174.8709121503.

The spelling of 1621699768 in words is "one billion, six hundred twenty-one million, six hundred ninety-nine thousand, seven hundred sixty-eight".