1647428085 has 32 divisors (see below), whose sum is σ = 3029760000. Its totient is φ = 848328768.

The previous prime is 1647428059. The next prime is 1647428087. The reversal of 1647428085 is 5808247461.

It is not a de Polignac number, because 1647428085 - 2⁸ = 1647427829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1647428085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1647428087) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206485 + ... + 214314.

It is an arithmetic number, because the mean of its divisors is an integer number (94680000).

Almost surely, 2^1647428085 is an apocalyptic number.

1647428085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1647428085 is a deficient number, since it is larger than the sum of its proper divisors (1382331915).

1647428085 is a wasteful number, since it uses less digits than its factorization.

1647428085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420842 (or 420836 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The square root of 1647428085 is about 40588.5215917013. The cubic root of 1647428085 is about 1181.0514627277.

The spelling of 1647428085 in words is "one billion, six hundred forty-seven million, four hundred twenty-eight thousand, eighty-five".