28776449 has 8 divisors (see below), whose sum is σ = 31292352. Its totient is φ = 26303760.

The previous prime is 28776443. The next prime is 28776457. The reversal of 28776449 is 94467782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28776449 - 2⁸ = 28776193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28776443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9407 + ... + 12084.

It is an arithmetic number, because the mean of its divisors is an integer number (3911544).

Almost surely, 2^28776449 is an apocalyptic number.

It is an amenable number.

28776449 is a deficient number, since it is larger than the sum of its proper divisors (2515903).

28776449 is a wasteful number, since it uses less digits than its factorization.

28776449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21607.

The product of its digits is 677376, while the sum is 47.

The square root of 28776449 is about 5364.3684623635. The cubic root of 28776449 is about 306.4401976100.

The spelling of 28776449 in words is "twenty-eight million, seven hundred seventy-six thousand, four hundred forty-nine".