1288797645 has 16 divisors (see below), whose sum is σ = 2170607040. Its totient is φ = 651181824.

The previous prime is 1288797641. The next prime is 1288797647. The reversal of 1288797645 is 5467978821.

It is not a de Polignac number, because 1288797645 - 2² = 1288797641 is a prime.

It is a super-3 number, since 3×1288797645³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288797641) 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, 2260764 + ... + 2261333.

It is an arithmetic number, because the mean of its divisors is an integer number (135662940).

Almost surely, 2^1288797645 is an apocalyptic number.

1288797645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1288797645 is a deficient number, since it is larger than the sum of its proper divisors (881809395).

1288797645 is a wasteful number, since it uses less digits than its factorization.

1288797645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4522124.

The product of its digits is 6773760, while the sum is 57.

The square root of 1288797645 is about 35899.8279243787. The cubic root of 1288797645 is about 1088.2489194579.

The spelling of 1288797645 in words is "one billion, two hundred eighty-eight million, seven hundred ninety-seven thousand, six hundred forty-five".