1285280045 has 24 divisors (see below), whose sum is σ = 1811944728. Its totient is φ = 872592000.

The previous prime is 1285280033. The next prime is 1285280047. The reversal of 1285280045 is 5400825821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 121242121 + 1164037924 = 11011^2 + 34118^2 .

It is not a de Polignac number, because 1285280045 - 2⁶ = 1285279981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1285279987 and 1285280014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285280047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1226 + ... + 50715.

It is an arithmetic number, because the mean of its divisors is an integer number (75497697).

Almost surely, 2^1285280045 is an apocalyptic number.

It is an amenable number.

1285280045 is a deficient number, since it is larger than the sum of its proper divisors (526664683).

1285280045 is a wasteful number, since it uses less digits than its factorization.

1285280045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52061 (or 52054 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 35.

The square root of 1285280045 is about 35850.8025712117. The cubic root of 1285280045 is about 1087.2579409291.

The spelling of 1285280045 in words is "one billion, two hundred eighty-five million, two hundred eighty thousand, forty-five".