28561807 has 4 divisors (see below), whose sum is σ = 30065080. Its totient is φ = 27058536.

The previous prime is 28561787. The next prime is 28561823. The reversal of 28561807 is 70816582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70816582 = 2 ⋅35408291.

It is a cyclic number.

It is not a de Polignac number, because 28561807 - 2⁷ = 28561679 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 (28561867) 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, 751608 + ... + 751645.

It is an arithmetic number, because the mean of its divisors is an integer number (7516270).

Almost surely, 2^28561807 is an apocalyptic number.

28561807 is a deficient number, since it is larger than the sum of its proper divisors (1503273).

28561807 is a wasteful number, since it uses less digits than its factorization.

28561807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503272.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 28561807 is about 5344.3247468693. The cubic root of 28561807 is about 305.6763883435.

The spelling of 28561807 in words is "twenty-eight million, five hundred sixty-one thousand, eight hundred seven".