1288928894 has 16 divisors (see below), whose sum is σ = 2115212400. Its totient is φ = 584194560.

The previous prime is 1288928891. The next prime is 1288928911. The reversal of 1288928894 is 4988298821.

It is a super-2 number, since 2×1288928894² = 3322675387576126472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288928891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76259 + ... + 91614.

It is an arithmetic number, because the mean of its divisors is an integer number (132200775).

Almost surely, 2^1288928894 is an apocalyptic number.

1288928894 is a deficient number, since it is larger than the sum of its proper divisors (826283506).

1288928894 is a wasteful number, since it uses less digits than its factorization.

1288928894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168235.

The product of its digits is 5308416, while the sum is 59.

The square root of 1288928894 is about 35901.6558671045. The cubic root of 1288928894 is about 1088.2858600215.

The spelling of 1288928894 in words is "one billion, two hundred eighty-eight million, nine hundred twenty-eight thousand, eight hundred ninety-four".