1628885685 has 48 divisors (see below), whose sum is σ = 3210083136. Its totient is φ = 700826112.

The previous prime is 1628885683. The next prime is 1628885689. The reversal of 1628885685 is 5865888261.

1628885685 = 168² + 169² + ... + 1697².

It is a happy number.

It is not a de Polignac number, because 1628885685 - 2¹ = 1628885683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628885683) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52687 + ... + 77676.

It is an arithmetic number, because the mean of its divisors is an integer number (66876732).

Almost surely, 2^1628885685 is an apocalyptic number.

1628885685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1628885685 is a deficient number, since it is larger than the sum of its proper divisors (1581197451).

1628885685 is a wasteful number, since it uses less digits than its factorization.

1628885685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130402 (or 130395 counting only the distinct ones).

The product of its digits is 7372800, while the sum is 57.

The square root of 1628885685 is about 40359.4559552034. The cubic root of 1628885685 is about 1176.6036795708.

The spelling of 1628885685 in words is "one billion, six hundred twenty-eight million, eight hundred eighty-five thousand, six hundred eighty-five".