28997361 has 24 divisors (see below), whose sum is σ = 43603560. Its totient is φ = 18547200.

The previous prime is 28997347. The next prime is 28997377. The reversal of 28997361 is 16379982.

28997361 is a `hidden beast` number, since 289 + 9 + 7 + 361 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5377761 + 23619600 = 2319^2 + 4860^2 .

It is not a de Polignac number, because 28997361 - 2¹⁹ = 28473073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28997341) 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, 62671 + ... + 63131.

It is an arithmetic number, because the mean of its divisors is an integer number (1816815).

Almost surely, 2^28997361 is an apocalyptic number.

It is an amenable number.

28997361 is a deficient number, since it is larger than the sum of its proper divisors (14606199).

28997361 is a wasteful number, since it uses less digits than its factorization.

28997361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737 (or 734 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 28997361 is about 5384.9197765612. The cubic root of 28997361 is about 307.2223629248. Note that the first 3 decimals are identical.

The spelling of 28997361 in words is "twenty-eight million, nine hundred ninety-seven thousand, three hundred sixty-one".