28765649 has 16 divisors (see below), whose sum is σ = 33436800. Its totient is φ = 24456960.

The previous prime is 28765643. The next prime is 28765657. The reversal of 28765649 is 94656782.

It is not a de Polignac number, because 28765649 - 2¹² = 28761553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28765643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36827 + ... + 37599.

It is an arithmetic number, because the mean of its divisors is an integer number (2089800).

Almost surely, 2^28765649 is an apocalyptic number.

It is an amenable number.

28765649 is a deficient number, since it is larger than the sum of its proper divisors (4671151).

28765649 is a wasteful number, since it uses less digits than its factorization.

28765649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000.

The product of its digits is 725760, while the sum is 47.

The square root of 28765649 is about 5363.3617256344. The cubic root of 28765649 is about 306.4018564390.

The spelling of 28765649 in words is "twenty-eight million, seven hundred sixty-five thousand, six hundred forty-nine".