1288779250 has 32 divisors (see below), whose sum is σ = 2631927168. Its totient is φ = 468646000.

The previous prime is 1288779229. The next prime is 1288779251. The reversal of 1288779250 is 529778821.

It is a junction number, because it is equal to n+sod(n) for n = 1288779194 and 1288779203.

It is not an unprimeable number, because it can be changed into a prime (1288779251) 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, 231574 + ... + 237073.

It is an arithmetic number, because the mean of its divisors is an integer number (82247724).

Almost surely, 2^1288779250 is an apocalyptic number.

1288779250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1288779250 is an abundant number, since it is smaller than the sum of its proper divisors (1343147918).

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

1288779250 is a wasteful number, since it uses less digits than its factorization.

1288779250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468675 (or 468665 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 49.

The square root of 1288779250 is about 35899.5717244649. The cubic root of 1288779250 is about 1088.2437419101.

The spelling of 1288779250 in words is "one billion, two hundred eighty-eight million, seven hundred seventy-nine thousand, two hundred fifty".