28197741 has 16 divisors (see below), whose sum is σ = 44170560. Its totient is φ = 15774720.

The previous prime is 28197739. The next prime is 28197779. The reversal of 28197741 is 14779182.

28197741 = 224² + 225² + ... + 457².

It is not a de Polignac number, because 28197741 - 2¹ = 28197739 is a prime.

It is a super-2 number, since 2×28197741² = 1590225195006162, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 28197741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28197731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32436 + ... + 33293.

It is an arithmetic number, because the mean of its divisors is an integer number (2760660).

Almost surely, 2^28197741 is an apocalyptic number.

It is an amenable number.

28197741 is a deficient number, since it is larger than the sum of its proper divisors (15972819).

28197741 is a wasteful number, since it uses less digits than its factorization.

28197741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65756.

The product of its digits is 28224, while the sum is 39.

The square root of 28197741 is about 5310.1545175258. The cubic root of 28197741 is about 304.3720521227.

The spelling of 28197741 in words is "twenty-eight million, one hundred ninety-seven thousand, seven hundred forty-one".