1288117278 has 96 divisors (see below), whose sum is σ = 3255183360. Its totient is φ = 360547200.

The previous prime is 1288117261. The next prime is 1288117291. The reversal of 1288117278 is 8727118821.

It is a happy number.

It is a super-2 number, since 2×1288117278² = 3318492243764258568, 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 47 ways as a sum of consecutive naturals, for example, 1502626 + ... + 1503482.

It is an arithmetic number, because the mean of its divisors is an integer number (33908160).

Almost surely, 2^1288117278 is an apocalyptic number.

1288117278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1288117278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1627591680).

1288117278 is an abundant number, since it is smaller than the sum of its proper divisors (1967066082).

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

1288117278 is a wasteful number, since it uses less digits than its factorization.

1288117278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102 (or 1099 counting only the distinct ones).

The product of its digits is 100352, while the sum is 45.

The square root of 1288117278 is about 35890.3507645161. The cubic root of 1288117278 is about 1088.0573871970.

The spelling of 1288117278 in words is "one billion, two hundred eighty-eight million, one hundred seventeen thousand, two hundred seventy-eight".