28764013 has 4 divisors (see below), whose sum is σ = 28798588. Its totient is φ = 28729440.

The previous prime is 28764011. The next prime is 28764023. The reversal of 28764013 is 31046782.

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 1075369 + 27688644 = 1037^2 + 5262^2 .

It is a cyclic number.

It is not a de Polignac number, because 28764013 - 2¹ = 28764011 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 (28764011) 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, 16008 + ... + 17713.

It is an arithmetic number, because the mean of its divisors is an integer number (7199647).

Almost surely, 2^28764013 is an apocalyptic number.

It is an amenable number.

28764013 is a deficient number, since it is larger than the sum of its proper divisors (34575).

28764013 is an equidigital number, since it uses as much as digits as its factorization.

28764013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34574.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 28764013 is about 5363.2092071818. The cubic root of 28764013 is about 306.3960476247.

It can be divided in two parts, 2876 and 4013, that added together give a square (6889 = 83²).

The spelling of 28764013 in words is "twenty-eight million, seven hundred sixty-four thousand, thirteen".