28893815 has 4 divisors (see below), whose sum is σ = 34672584. Its totient is φ = 23115048.

The previous prime is 28893811. The next prime is 28893827. The reversal of 28893815 is 51839882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51839882 = 2 ⋅25919941.

It is a cyclic number.

It is not a de Polignac number, because 28893815 - 2² = 28893811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28893811) 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, 2889377 + ... + 2889386.

It is an arithmetic number, because the mean of its divisors is an integer number (8668146).

Almost surely, 2^28893815 is an apocalyptic number.

28893815 is a deficient number, since it is larger than the sum of its proper divisors (5778769).

28893815 is an equidigital number, since it uses as much as digits as its factorization.

28893815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5778768.

The product of its digits is 138240, while the sum is 44.

The square root of 28893815 is about 5375.2967359951. The cubic root of 28893815 is about 306.8562423982.

It can be divided in two parts, 2 and 8893815, that multiplied together give a triangular number (17787630 = T₅₉₆₄).

The spelling of 28893815 in words is "twenty-eight million, eight hundred ninety-three thousand, eight hundred fifteen".