1628865444 has 24 divisors (see below), whose sum is σ = 3801558880. Its totient is φ = 542830464.

The previous prime is 1628865443. The next prime is 1628865463. The reversal of 1628865444 is 4445688261.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1628865393 and 1628865402.

It is not an unprimeable number, because it can be changed into a prime (1628865443) 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, 49827 + ... + 75765.

Almost surely, 2^1628865444 is an apocalyptic number.

It is an amenable number.

1628865444 is an abundant number, since it is smaller than the sum of its proper divisors (2172693436).

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

1628865444 is a wasteful number, since it uses less digits than its factorization.

1628865444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31179 (or 31177 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 48.

The square root of 1628865444 is about 40359.2051953455. The cubic root of 1628865444 is about 1176.5988059459.

The spelling of 1628865444 in words is "one billion, six hundred twenty-eight million, eight hundred sixty-five thousand, four hundred forty-four".