1428725355849 has 81 divisors (see below), whose sum is σ = 2351179994709. Its totient is φ = 835366371840.

The previous prime is 1428725355839. The next prime is 1428725355857. The reversal of 1428725355849 is 9485535278241.

It is a happy number.

The square root of 1428725355849 is 1195293.

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

1428725355849 is a `hidden beast` number, since 1 + 4 + 2 + 8 + 7 + 2 + 535 + 58 + 49 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6382891449 + 1422342464400 = 79893^2 + 1192620^2 .

It is not a de Polignac number, because 1428725355849 - 2²³ = 1428716967241 is a prime.

It is a super-2 number, since 2×1428725355849² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1428725355839) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1143894777 + ... + 1143896025.

Almost surely, 2^{1428725355849} is an apocalyptic number.

1428725355849 is the 1195293-rd square number.

1428725355849 is the 597647-th centered octagonal number.

It is an amenable number.

1428725355849 is a deficient number, since it is larger than the sum of its proper divisors (922454638860).

1428725355849 is an equidigital number, since it uses as much as digits as its factorization.

1428725355849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2584 (or 1292 counting only the distinct ones).

The product of its digits is 96768000, while the sum is 63.

The spelling of 1428725355849 in words is "one trillion, four hundred twenty-eight billion, seven hundred twenty-five million, three hundred fifty-five thousand, eight hundred forty-nine".