1280225688 has 32 divisors (see below), whose sum is σ = 3657788160. Its totient is φ = 365778720.

The previous prime is 1280225657. The next prime is 1280225689. The reversal of 1280225688 is 8865220821.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280225689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3810028 + ... + 3810363.

It is an arithmetic number, because the mean of its divisors is an integer number (114305880).

Almost surely, 2^1280225688 is an apocalyptic number.

It is an amenable number.

1280225688 is an abundant number, since it is smaller than the sum of its proper divisors (2377562472).

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

1280225688 is a wasteful number, since it uses less digits than its factorization.

1280225688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7620407 (or 7620403 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The square root of 1280225688 is about 35780.2415866634. The cubic root of 1280225688 is about 1085.8308565840.

The spelling of 1280225688 in words is "one billion, two hundred eighty million, two hundred twenty-five thousand, six hundred eighty-eight".