28157761 has 8 divisors (see below), whose sum is σ = 28492704. Its totient is φ = 27825120.

The previous prime is 28157741. The next prime is 28157771. The reversal of 28157761 is 16775182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28157761 - 2⁹ = 28157249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28157761.

It is not an unprimeable number, because it can be changed into a prime (28157711) 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 7 ways as a sum of consecutive naturals, for example, 36621 + ... + 37381.

It is an arithmetic number, because the mean of its divisors is an integer number (3561588).

Almost surely, 2^28157761 is an apocalyptic number.

It is an amenable number.

28157761 is a deficient number, since it is larger than the sum of its proper divisors (334943).

28157761 is a wasteful number, since it uses less digits than its factorization.

28157761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151.

The product of its digits is 23520, while the sum is 37.

The square root of 28157761 is about 5306.3886966561. The cubic root of 28157761 is about 304.2281333796.

The spelling of 28157761 in words is "twenty-eight million, one hundred fifty-seven thousand, seven hundred sixty-one".