1268628978 has 32 divisors (see below), whose sum is σ = 2689485120. Its totient is φ = 397560320.

The previous prime is 1268628943. The next prime is 1268628979. The reversal of 1268628978 is 8798268621.

It is not an unprimeable number, because it can be changed into a prime (1268628979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92638 + ... + 105446.

It is an arithmetic number, because the mean of its divisors is an integer number (84046410).

Almost surely, 2^1268628978 is an apocalyptic number.

1268628978 is an abundant number, since it is smaller than the sum of its proper divisors (1420856142).

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

1268628978 is a wasteful number, since it uses less digits than its factorization.

1268628978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13802.

The product of its digits is 4644864, while the sum is 57.

The square root of 1268628978 is about 35617.8182655816. The cubic root of 1268628978 is about 1082.5423012376.

The spelling of 1268628978 in words is "one billion, two hundred sixty-eight million, six hundred twenty-eight thousand, nine hundred seventy-eight".