28529574649 has 9 divisors (see below), whose sum is σ = 28973237391. Its totient is φ = 28092612240.

The previous prime is 28529574589. The next prime is 28529574707. The reversal of 28529574649 is 94647592582.

The square root of 28529574649 is 168907.

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

It can be written as a sum of positive squares in only one way, i.e., 22629049 + 28506945600 = 4757^2 + 168840^2 .

It is not a de Polignac number, because 28529574649 - 2¹⁵ = 28529541881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28529574449) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11315509 + ... + 11318029.

It is an arithmetic number, because the mean of its divisors is an integer number (3219248599).

Almost surely, 2^28529574649 is an apocalyptic number.

28529574649 is the 168907-th square number.

28529574649 is the 84454-th centered octagonal number.

It is an amenable number.

28529574649 is a deficient number, since it is larger than the sum of its proper divisors (443662742).

28529574649 is an frugal number, since it uses more digits than its factorization.

28529574649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5176 (or 2588 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 61.

The spelling of 28529574649 in words is "twenty-eight billion, five hundred twenty-nine million, five hundred seventy-four thousand, six hundred forty-nine".