1284878925625 has 15 divisors (see below), whose sum is σ = 1605620117563. Its totient is φ = 1027880470000.

The previous prime is 1284878925619. The next prime is 1284878925637. The reversal of 1284878925625 is 5265298784821.

The square root of 1284878925625 is 1133525.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 1221473671209 + 63405254416 = 1105203^2 + 251804^2 .

It is not a de Polignac number, because 1284878925625 - 2⁷ = 1284878925497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 28315455 + ... + 28360795.

Almost surely, 2^{1284878925625} is an apocalyptic number.

1284878925625 is the 1133525-th square number.

1284878925625 is the 566763-rd centered octagonal number.

It is an amenable number.

1284878925625 is a deficient number, since it is larger than the sum of its proper divisors (320741191938).

1284878925625 is an frugal number, since it uses more digits than its factorization.

1284878925625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90702 (or 45346 counting only the distinct ones).

The product of its digits is 154828800, while the sum is 67.

The spelling of 1284878925625 in words is "one trillion, two hundred eighty-four billion, eight hundred seventy-eight million, nine hundred twenty-five thousand, six hundred twenty-five".