1281772280 has 16 divisors (see below), whose sum is σ = 2883987720. Its totient is φ = 512708896.

The previous prime is 1281772249. The next prime is 1281772291. The reversal of 1281772280 is 822771821.

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, 16022114 + ... + 16022193.

Almost surely, 2^1281772280 is an apocalyptic number.

1281772280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281772280 is an abundant number, since it is smaller than the sum of its proper divisors (1602215440).

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

1281772280 is a wasteful number, since it uses less digits than its factorization.

1281772280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32044318 (or 32044314 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 38.

The square root of 1281772280 is about 35801.8474383655. The cubic root of 1281772280 is about 1086.2679309575.

The spelling of 1281772280 in words is "one billion, two hundred eighty-one million, seven hundred seventy-two thousand, two hundred eighty".