1278509456 has 40 divisors (see below), whose sum is σ = 2866840320. Its totient is φ = 540993024.

The previous prime is 1278509447. The next prime is 1278509461. The reversal of 1278509456 is 6549058721.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 1278509456.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63401 + ... + 81096.

It is an arithmetic number, because the mean of its divisors is an integer number (71671008).

Almost surely, 2^1278509456 is an apocalyptic number.

1278509456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1278509456 is an abundant number, since it is smaller than the sum of its proper divisors (1588330864).

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

1278509456 is a wasteful number, since it uses less digits than its factorization.

1278509456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144591 (or 144585 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 47.

The square root of 1278509456 is about 35756.2505864359. The cubic root of 1278509456 is about 1085.3454288881.

The spelling of 1278509456 in words is "one billion, two hundred seventy-eight million, five hundred nine thousand, four hundred fifty-six".