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28657421 = 135937363
BaseRepresentation
bin110110101010…
…0011100001101
31222220221120222
41231110130031
524314014141
62502121125
7465404222
oct155243415
958827528
1028657421
11151a3821
1297201a5
135c24b70
143b3d949
1527b114b
hex1b5470d

28657421 has 8 divisors (see below), whose sum is σ = 31385760. Its totient is φ = 26003952.

The previous prime is 28657331. The next prime is 28657439. The reversal of 28657421 is 12475682.

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

It is not a de Polignac number, because 28657421 - 218 = 28395277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28650421) 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, 17915 + ... + 19448.

It is an arithmetic number, because the mean of its divisors is an integer number (3923220).

Almost surely, 228657421 is an apocalyptic number.

It is an amenable number.

28657421 is a deficient number, since it is larger than the sum of its proper divisors (2728339).

28657421 is a wasteful number, since it uses less digits than its factorization.

28657421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37435.

The product of its digits is 26880, while the sum is 35.

The square root of 28657421 is about 5353.2626500107. The cubic root of 28657421 is about 306.0171042883.

The spelling of 28657421 in words is "twenty-eight million, six hundred fifty-seven thousand, four hundred twenty-one".

Divisors: 1 13 59 767 37363 485719 2204417 28657421