1780928028 has 36 divisors (see below), whose sum is σ = 4911045048. Its totient is φ = 539675040.

The previous prime is 1780928027. The next prime is 1780928053. The reversal of 1780928028 is 8208290871.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780928027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2248251 + ... + 2249042.

It is an arithmetic number, because the mean of its divisors is an integer number (136417918).

Almost surely, 2^1780928028 is an apocalyptic number.

1780928028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1780928028 is an abundant number, since it is smaller than the sum of its proper divisors (3130117020).

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

1780928028 is a wasteful number, since it uses less digits than its factorization.

1780928028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4497314 (or 4497309 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 1780928028 is about 42201.0429728935. The cubic root of 1780928028 is about 1212.1288543851.

The spelling of 1780928028 in words is "one billion, seven hundred eighty million, nine hundred twenty-eight thousand, twenty-eight".