28058077 has 4 divisors (see below), whose sum is σ = 28213276. Its totient is φ = 27902880.

The previous prime is 28058057. The next prime is 28058081. The reversal of 28058077 is 77085082.

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 799236 + 27258841 = 894^2 + 5221^2 .

It is a cyclic number.

It is not a de Polignac number, because 28058077 - 2¹¹ = 28056029 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 (28058027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77328 + ... + 77689.

It is an arithmetic number, because the mean of its divisors is an integer number (7053319).

Almost surely, 2^28058077 is an apocalyptic number.

It is an amenable number.

28058077 is a deficient number, since it is larger than the sum of its proper divisors (155199).

28058077 is a wasteful number, since it uses less digits than its factorization.

28058077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155198.

The product of its (nonzero) digits is 31360, while the sum is 37.

The square root of 28058077 is about 5296.9875401024. The cubic root of 28058077 is about 303.8686997909.

The spelling of 28058077 in words is "twenty-eight million, fifty-eight thousand, seventy-seven".