1280512256 has 18 divisors (see below), whose sum is σ = 2556023022. Its totient is φ = 640256000.

The previous prime is 1280512249. The next prime is 1280512279. The reversal of 1280512256 is 6522150821.

It can be written as a sum of positive squares in only one way, i.e., 1024000000 + 256512256 = 32000^2 + 16016^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2500745 + ... + 2501256.

It is an arithmetic number, because the mean of its divisors is an integer number (142001279).

Almost surely, 2^1280512256 is an apocalyptic number.

1280512256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1280512256 is a deficient number, since it is larger than the sum of its proper divisors (1275510766).

1280512256 is an frugal number, since it uses more digits than its factorization.

1280512256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5002017 (or 5002003 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 1280512256 is about 35784.2459191192. The cubic root of 1280512256 is about 1085.9118686444.

The spelling of 1280512256 in words is "one billion, two hundred eighty million, five hundred twelve thousand, two hundred fifty-six".