1268894978 has 32 divisors (see below), whose sum is σ = 2113921152. Its totient is φ = 567504000.

The previous prime is 1268894947. The next prime is 1268894989. The reversal of 1268894978 is 8794988621.

It is a super-2 number, since 2×1268894978² = 3220188930387240968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1268894978.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157025 + ... + 164907.

It is an arithmetic number, because the mean of its divisors is an integer number (66060036).

Almost surely, 2^1268894978 is an apocalyptic number.

1268894978 is a deficient number, since it is larger than the sum of its proper divisors (845026174).

1268894978 is a wasteful number, since it uses less digits than its factorization.

1268894978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8090.

The product of its digits is 13934592, while the sum is 62.

The square root of 1268894978 is about 35621.5521559631. The cubic root of 1268894978 is about 1082.6179566981.

The spelling of 1268894978 in words is "one billion, two hundred sixty-eight million, eight hundred ninety-four thousand, nine hundred seventy-eight".