1655280 has 180 divisors, whose sum is σ = 6431880. Its totient is φ = 380160.

The previous prime is 1655279. The next prime is 1655281. The reversal of 1655280 is 825561.

1655280 is a `hidden beast` number, since 1 + 655 + 2 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1655279) and next prime (1655281).

It is a tau number, because it is divible by the number of its divisors (180).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655281) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 87111 + ... + 87129.

2^1655280 is an apocalyptic number.

1655280 is a gapful number since it is divisible by the number (10) 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 1655280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3215940).

1655280 is an abundant number, since it is smaller than the sum of its proper divisors (4776600).

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

1655280 is a wasteful number, since it uses less digits than its factorization.

1655280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1655280 is about 1286.5768535148. The cubic root of 1655280 is about 118.2924851847.

It can be divided in two parts, 165 and 5280, that added together give a palindrome (5445).

The spelling of 1655280 in words is "one million, six hundred fifty-five thousand, two hundred eighty".