1268369890 has 48 divisors (see below), whose sum is σ = 2443066488. Its totient is φ = 473962752.

The previous prime is 1268369863. The next prime is 1268369911. The reversal of 1268369890 is 989638621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1157972841 + 110397049 = 34029^2 + 10507^2 .

It is a super-2 number, since 2×1268369890² = 3217524355717224200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 261124 + ... + 265936.

Almost surely, 2^1268369890 is an apocalyptic number.

1268369890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1268369890 is a deficient number, since it is larger than the sum of its proper divisors (1174696598).

1268369890 is a wasteful number, since it uses less digits than its factorization.

1268369890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4931 (or 4912 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 1268369890 is about 35614.1810238562. The cubic root of 1268369890 is about 1082.4686015140.

The spelling of 1268369890 in words is "one billion, two hundred sixty-eight million, three hundred sixty-nine thousand, eight hundred ninety".