1278707984 has 10 divisors (see below), whose sum is σ = 2477496750. Its totient is φ = 639353984.

The previous prime is 1278707957. The next prime is 1278707987. The reversal of 1278707984 is 4897078721.

It can be written as a sum of positive squares in only one way, i.e., 1130842384 + 147865600 = 33628^2 + 12160^2 .

It is not an unprimeable number, because it can be changed into a prime (1278707987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39959609 + ... + 39959640.

It is an arithmetic number, because the mean of its divisors is an integer number (247749675).

Almost surely, 2^1278707984 is an apocalyptic number.

It is an amenable number.

1278707984 is a deficient number, since it is larger than the sum of its proper divisors (1198788766).

1278707984 is an equidigital number, since it uses as much as digits as its factorization.

1278707984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79919257 (or 79919251 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 53.

The square root of 1278707984 is about 35759.0266086760. The cubic root of 1278707984 is about 1085.4016037576.

The spelling of 1278707984 in words is "one billion, two hundred seventy-eight million, seven hundred seven thousand, nine hundred eighty-four".