1280064340 has 12 divisors (see below), whose sum is σ = 2688135156. Its totient is φ = 512025728.

The previous prime is 1280064337. The next prime is 1280064343. The reversal of 1280064340 is 434600821.

It is an interprime number because it is at equal distance from previous prime (1280064337) and next prime (1280064343).

It can be written as a sum of positive squares in 2 ways, for example, as 721781956 + 558282384 = 26866^2 + 23628^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1280064299 and 1280064308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280064343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32001589 + ... + 32001628.

It is an arithmetic number, because the mean of its divisors is an integer number (224011263).

Almost surely, 2^1280064340 is an apocalyptic number.

1280064340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1280064340 is an abundant number, since it is smaller than the sum of its proper divisors (1408070816).

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

1280064340 is a wasteful number, since it uses less digits than its factorization.

1280064340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64003226 (or 64003224 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 1280064340 is about 35777.9868075329. The cubic root of 1280064340 is about 1085.7852385862.

The spelling of 1280064340 in words is "one billion, two hundred eighty million, sixty-four thousand, three hundred forty".