1628913920 has 36 divisors (see below), whose sum is σ = 3901760940. Its totient is φ = 651565056.

The previous prime is 1628913893. The next prime is 1628913929. The reversal of 1628913920 is 293198261.

It can be written as a sum of positive squares in 2 ways, for example, as 836829184 + 792084736 = 28928^2 + 28144^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1628913929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635015 + ... + 637574.

Almost surely, 2^1628913920 is an apocalyptic number.

1628913920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1628913920 is an abundant number, since it is smaller than the sum of its proper divisors (2272847020).

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

1628913920 is an equidigital number, since it uses as much as digits as its factorization.

1628913920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272610 (or 1272596 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 1628913920 is about 40359.8057477981. The cubic root of 1628913920 is about 1176.6104779224.

The spelling of 1628913920 in words is "one billion, six hundred twenty-eight million, nine hundred thirteen thousand, nine hundred twenty".