1278700978 has 8 divisors (see below), whose sum is σ = 1918260972. Its totient is φ = 639280656.

The previous prime is 1278700957. The next prime is 1278700979. The reversal of 1278700978 is 8790078721.

It can be written as a sum of positive squares in 2 ways, for example, as 1255497489 + 23203489 = 35433^2 + 4817^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1278700978² = 3270152382276312968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1278700979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7825 + ... + 51172.

Almost surely, 2^1278700978 is an apocalyptic number.

1278700978 is a deficient number, since it is larger than the sum of its proper divisors (639559994).

1278700978 is a wasteful number, since it uses less digits than its factorization.

1278700978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69836.

The product of its (nonzero) digits is 395136, while the sum is 49.

The square root of 1278700978 is about 35758.9286472624. The cubic root of 1278700978 is about 1085.3996214605.

The spelling of 1278700978 in words is "one billion, two hundred seventy-eight million, seven hundred thousand, nine hundred seventy-eight".