28807061 has 4 divisors (see below), whose sum is σ = 30501612. Its totient is φ = 27112512.

The previous prime is 28807039. The next prime is 28807069. The reversal of 28807061 is 16070882.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19412836 + 9394225 = 4406^2 + 3065^2 .

It is a cyclic number.

It is not a de Polignac number, because 28807061 - 2¹⁸ = 28544917 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 (28807069) 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, 847250 + ... + 847283.

It is an arithmetic number, because the mean of its divisors is an integer number (7625403).

Almost surely, 2^28807061 is an apocalyptic number.

It is an amenable number.

28807061 is a deficient number, since it is larger than the sum of its proper divisors (1694551).

28807061 is a wasteful number, since it uses less digits than its factorization.

28807061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694550.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 28807061 is about 5367.2209755142. The cubic root of 28807061 is about 306.5488214239.

The spelling of 28807061 in words is "twenty-eight million, eight hundred seven thousand, sixty-one".