256780120 has 16 divisors (see below), whose sum is σ = 577755360. Its totient is φ = 102712032.

The previous prime is 256780103. The next prime is 256780151. The reversal of 256780120 is 21087652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3209712 + ... + 3209791.

It is an arithmetic number, because the mean of its divisors is an integer number (36109710).

Almost surely, 2^256780120 is an apocalyptic number.

256780120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256780120 is an abundant number, since it is smaller than the sum of its proper divisors (320975240).

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

256780120 is a wasteful number, since it uses less digits than its factorization.

256780120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6419514 (or 6419510 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 256780120 is about 16024.3602056369. The cubic root of 256780120 is about 635.6047476246.

The spelling of 256780120 in words is "two hundred fifty-six million, seven hundred eighty thousand, one hundred twenty".