28756061 has 4 divisors (see below), whose sum is σ = 30447612. Its totient is φ = 27064512.

The previous prime is 28756043. The next prime is 28756093. The reversal of 28756061 is 16065782.

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 10956100 + 17799961 = 3310^2 + 4219^2 .

It is a cyclic number.

It is not a de Polignac number, because 28756061 - 2¹⁸ = 28493917 is a prime.

It is a super-2 number, since 2×28756061² = 1653822088471442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28756001) 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, 845750 + ... + 845783.

It is an arithmetic number, because the mean of its divisors is an integer number (7611903).

Almost surely, 2^28756061 is an apocalyptic number.

It is an amenable number.

28756061 is a deficient number, since it is larger than the sum of its proper divisors (1691551).

28756061 is a wasteful number, since it uses less digits than its factorization.

28756061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691550.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 28756061 is about 5362.4678087612. The cubic root of 28756061 is about 306.3678099569.

The spelling of 28756061 in words is "twenty-eight million, seven hundred fifty-six thousand, sixty-one".