28202077 has 4 divisors (see below), whose sum is σ = 28246716. Its totient is φ = 28157440.

The previous prime is 28202039. The next prime is 28202089. The reversal of 28202077 is 77020282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77020282 = 2 ⋅38510141.

It can be written as a sum of positive squares in 2 ways, for example, as 16818201 + 11383876 = 4101^2 + 3374^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28202077 is a prime.

It is a super-2 number, since 2×28202077² = 1590714294227858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28202477) 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, 21358 + ... + 22639.

It is an arithmetic number, because the mean of its divisors is an integer number (7061679).

Almost surely, 2^28202077 is an apocalyptic number.

It is an amenable number.

28202077 is a deficient number, since it is larger than the sum of its proper divisors (44639).

28202077 is an equidigital number, since it uses as much as digits as its factorization.

28202077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44638.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 28202077 is about 5310.5627762037. The cubic root of 28202077 is about 304.3876525400.

The spelling of 28202077 in words is "twenty-eight million, two hundred two thousand, seventy-seven".