28507061 has 4 divisors (see below), whose sum is σ = 31098624. Its totient is φ = 25915500.

The previous prime is 28507033. The next prime is 28507109. The reversal of 28507061 is 16070582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28507061 - 2¹⁴ = 28490677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28507021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1295765 + ... + 1295786.

It is an arithmetic number, because the mean of its divisors is an integer number (7774656).

Almost surely, 2^28507061 is an apocalyptic number.

It is an amenable number.

28507061 is a deficient number, since it is larger than the sum of its proper divisors (2591563).

28507061 is a wasteful number, since it uses less digits than its factorization.

28507061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591562.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 28507061 is about 5339.2004083009. The cubic root of 28507061 is about 305.4809611310.

The spelling of 28507061 in words is "twenty-eight million, five hundred seven thousand, sixty-one".