255780028 has 72 divisors (see below), whose sum is σ = 552138272. Its totient is φ = 101523456.

The previous prime is 255780023. The next prime is 255780043. The reversal of 255780028 is 820087552.

It is a hoax number, since the sum of its digits (37) 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 (255780023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 590500 + ... + 590932.

Almost surely, 2^255780028 is an apocalyptic number.

255780028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255780028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276069136).

255780028 is an abundant number, since it is smaller than the sum of its proper divisors (296358244).

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

255780028 is a wasteful number, since it uses less digits than its factorization.

255780028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 255780028 is about 15993.1243976904. The cubic root of 255780028 is about 634.7785021176.

The spelling of 255780028 in words is "two hundred fifty-five million, seven hundred eighty thousand, twenty-eight".