28120061 has 4 divisors (see below), whose sum is σ = 28177824. Its totient is φ = 28062300.

The previous prime is 28120039. The next prime is 28120073. The reversal of 28120061 is 16002182.

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 28120061 - 2⁶ = 28119997 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 (28120021) 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, 28145 + ... + 29126.

It is an arithmetic number, because the mean of its divisors is an integer number (7044456).

Almost surely, 2^28120061 is an apocalyptic number.

28120061 is the 2372-nd centered decagonal number.

It is an amenable number.

28120061 is a deficient number, since it is larger than the sum of its proper divisors (57763).

28120061 is an equidigital number, since it uses as much as digits as its factorization.

28120061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57762.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 28120061 is about 5302.8351850685. The cubic root of 28120061 is about 304.0922972576.

The spelling of 28120061 in words is "twenty-eight million, one hundred twenty thousand, sixty-one".