28061957 has 18 divisors (see below), whose sum is σ = 35888454. Its totient is φ = 21861840.

The previous prime is 28061923. The next prime is 28061959. The reversal of 28061957 is 75916082.

It can be written as a sum of positive squares in only one way, i.e., 19945156 + 8116801 = 4466^2 + 2849^2 .

It is not a de Polignac number, because 28061957 - 2⁶ = 28061893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28061957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28061959) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3563 + ... + 8295.

It is an arithmetic number, because the mean of its divisors is an integer number (1993803).

Almost surely, 2^28061957 is an apocalyptic number.

It is an amenable number.

28061957 is a deficient number, since it is larger than the sum of its proper divisors (7826497).

28061957 is a wasteful number, since it uses less digits than its factorization.

28061957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4769 (or 4751 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 28061957 is about 5297.3537733476. The cubic root of 28061957 is about 303.8827059326.

The spelling of 28061957 in words is "twenty-eight million, sixty-one thousand, nine hundred fifty-seven".