28867649 has 16 divisors (see below), whose sum is σ = 31752000. Its totient is φ = 26135040.

The previous prime is 28867633. The next prime is 28867651. The reversal of 28867649 is 94676882.

It is not a de Polignac number, because 28867649 - 2⁴ = 28867633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28867597 and 28867606.

It is not an unprimeable number, because it can be changed into a prime (28867609) 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, 57602 + ... + 58100.

It is an arithmetic number, because the mean of its divisors is an integer number (1984500).

Almost surely, 2^28867649 is an apocalyptic number.

It is an amenable number.

28867649 is a deficient number, since it is larger than the sum of its proper divisors (2884351).

28867649 is a wasteful number, since it uses less digits than its factorization.

28867649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640.

The product of its digits is 1161216, while the sum is 50.

The square root of 28867649 is about 5372.8622725694. The cubic root of 28867649 is about 306.7635855973.

The spelling of 28867649 in words is "twenty-eight million, eight hundred sixty-seven thousand, six hundred forty-nine".