1268899840 has 112 divisors (see below), whose sum is σ = 3280794048. Its totient is φ = 468320256.

The previous prime is 1268899837. The next prime is 1268899889. The reversal of 1268899840 is 489988621.

It is a super-2 number, since 2×1268899840² = 3220213607904051200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 531289 + ... + 533671.

It is an arithmetic number, because the mean of its divisors is an integer number (29292804).

Almost surely, 2^1268899840 is an apocalyptic number.

1268899840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1268899840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1640397024).

1268899840 is an abundant number, since it is smaller than the sum of its proper divisors (2011894208).

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

1268899840 is an equidigital number, since it uses as much as digits as its factorization.

1268899840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427 (or 2403 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 55.

The square root of 1268899840 is about 35621.6204010991. The cubic root of 1268899840 is about 1082.6193394450.

The spelling of 1268899840 in words is "one billion, two hundred sixty-eight million, eight hundred ninety-nine thousand, eight hundred forty".