28356202449 has 9 divisors (see below), whose sum is σ = 40959688809. Its totient is φ = 18903798180.

The previous prime is 28356202447. The next prime is 28356202477. The reversal of 28356202449 is 94420265382.

The square root of 28356202449 is 168393.

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

28356202449 is a `hidden beast` number, since 2 + 83 + 562 + 0 + 2 + 4 + 4 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 28356202449 - 2¹ = 28356202447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28356202447) 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, 477114 + ... + 533244.

Almost surely, 2^28356202449 is an apocalyptic number.

28356202449 is the 168393-rd square number.

28356202449 is the 84197-th centered octagonal number.

It is an amenable number.

28356202449 is a deficient number, since it is larger than the sum of its proper divisors (12603486360).

28356202449 is an frugal number, since it uses more digits than its factorization.

28356202449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112268 (or 56134 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 28356202449 in words is "twenty-eight billion, three hundred fifty-six million, two hundred two thousand, four hundred forty-nine".