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28390541 = 194433373
BaseRepresentation
bin110110001001…
…1010010001101
31222102101111112
41230103102031
524231444131
62452301405
7463213154
oct154232215
958371445
1028390541
1115031263
129611865
135b6054a
143ab059b
15275c02b
hex1b1348d

28390541 has 8 divisors (see below), whose sum is σ = 29961120. Its totient is φ = 26827632.

The previous prime is 28390519. The next prime is 28390543. The reversal of 28390541 is 14509382.

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 28390541 - 26 = 28390477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28390498 and 28390507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28390543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6731 + ... + 10103.

It is an arithmetic number, because the mean of its divisors is an integer number (3745140).

Almost surely, 228390541 is an apocalyptic number.

It is an amenable number.

28390541 is a deficient number, since it is larger than the sum of its proper divisors (1570579).

28390541 is a wasteful number, since it uses less digits than its factorization.

28390541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3835.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 28390541 is about 5328.2774890203. The cubic root of 28390541 is about 305.0641842884.

The spelling of 28390541 in words is "twenty-eight million, three hundred ninety thousand, five hundred forty-one".

Divisors: 1 19 443 3373 8417 64087 1494239 28390541