28840577 has 4 divisors (see below), whose sum is σ = 28967856. Its totient is φ = 28713300.

The previous prime is 28840561. The next prime is 28840583. The reversal of 28840577 is 77504882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28840577 - 2⁴ = 28840561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28840277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63299 + ... + 63752.

It is an arithmetic number, because the mean of its divisors is an integer number (7241964).

Almost surely, 2^28840577 is an apocalyptic number.

It is an amenable number.

28840577 is a deficient number, since it is larger than the sum of its proper divisors (127279).

28840577 is a wasteful number, since it uses less digits than its factorization.

28840577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127278.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 28840577 is about 5370.3423540776. The cubic root of 28840577 is about 306.6676615962.

The spelling of 28840577 in words is "twenty-eight million, eight hundred forty thousand, five hundred seventy-seven".