1621094668 has 24 divisors (see below), whose sum is σ = 3055680320. Its totient is φ = 750027600.

The previous prime is 1621094639. The next prime is 1621094669. The reversal of 1621094668 is 8664901261.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (1621094669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244758 + ... + 251293.

Almost surely, 2^1621094668 is an apocalyptic number.

It is an amenable number.

1621094668 is a deficient number, since it is larger than the sum of its proper divisors (1434585652).

1621094668 is a wasteful number, since it uses less digits than its factorization.

1621094668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496117 (or 496115 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 1621094668 is about 40262.8199211133. The cubic root of 1621094668 is about 1174.7247686118.

The spelling of 1621094668 in words is "one billion, six hundred twenty-one million, ninety-four thousand, six hundred sixty-eight".