1628641556 has 12 divisors (see below), whose sum is σ = 2910763968. Its totient is φ = 796994712.

The previous prime is 1628641517. The next prime is 1628641559. The reversal of 1628641556 is 6551468261.

It is a super-2 number, since 2×1628641556² = 5304946635860202272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628641559) 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, 4331306 + ... + 4331681.

It is an arithmetic number, because the mean of its divisors is an integer number (242563664).

Almost surely, 2^1628641556 is an apocalyptic number.

It is an amenable number.

1628641556 is a deficient number, since it is larger than the sum of its proper divisors (1282122412).

1628641556 is a wasteful number, since it uses less digits than its factorization.

1628641556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8663038 (or 8663036 counting only the distinct ones).

The product of its digits is 345600, while the sum is 44.

The square root of 1628641556 is about 40356.4314081411. The cubic root of 1628641556 is about 1176.5448955334.

The spelling of 1628641556 in words is "one billion, six hundred twenty-eight million, six hundred forty-one thousand, five hundred fifty-six".